ARENA SURVIVAL ROGUELITE

Two in the Arena

Mage Rin and swordsman Kohaku — a tale of survival and escape, taken on by two.

OVERVIEW

Overview

A fully roguelike arena-survival action game where you fend off waves of enemies. You control the mage Rin and survive the arena alongside Kohaku, a swordsman who fights by his own judgment.

A run lasts a few to a dozen-odd minutes. Rather than endless, it is a clear-based game with a full story and ending. Even when you fall, you earn points on the permanent-growth "Memoria Tree," so every run moves you forward.

3 Difficulty Levels

Normal / Easy / VeryEasy. Even if action games aren't your strength, you can reach the story's ending.

Normal Stages 1–10 + Boss Battles

The threat level rises step by step.

Hard Stages 1–10

A further challenge after clearing. A boss appears on every stage, sustaining the tension.

GAME FEATURES

Features

1. True co-op with a partner who thinks for himself

You control only yourself. Your partner Kohaku changes how he fights at a single command—guarding, supporting, and fighting alongside you.

2. Freeze → finish for a chain explosion

Land the finishing blow on a frozen enemy and the freeze chains outward. The thrill of building it up and pulling it off exactly as planned.

3. Permanent growth that always moves you forward

Earn Memoria Points regardless of the outcome. Grow reliably stronger through the 36-node Memoria Tree. Not a single run is wasted.

CHARACTERS

Characters

Rin — Mage (Player-controlled)

A backline attacker wielding magic bolts, wide-area freezes, and meteors. She dominates the field with freezes and lands the chain's finishing blow herself. Shield and Heal let her survive, too.

Kohaku — Swordsman (Self-acting partner)

A frontline melee swordsman. He absorbs enemy assaults with parries and guards, and cuts through their ranks with sweeping strikes. He switches tactics in response to your commands.

The Collector

An elegant gentleman who calls himself "the Collector." What he collects is not strength, but the "genuine article" that never breaks under any adversity. Beneath a gentle smile, from the stands, he quietly appraises those who survive to the end—today, as ever.

CONTROLS

Controls

Supports both keyboard and gamepad.

Rin's Controls

Action	Keyboard / Mouse	Gamepad
Move	W / A / S / D	Left Stick
Camera	Mouse Move	Right Stick
Normal Attack	Left Click	×
Ice Nova	Left Shift	△
Meteor	E	R1
Shield	Space	○
Heal	Right Click	□
Ult	Q	L1

Commands to Kohaku

Command	Keyboard	Gamepad
Attack	1	D-Pad ↑
Defend	2	D-Pad ↓
Taunt	3	D-Pad ←
Rescue	4	D-Pad →

System Controls

Action	Keyboard	Gamepad
Pause Menu	ESC	Options
Confirm	Enter / Space	×
Cancel / Back	ESC	○
Cursor Move	↑ ↓ (W / S)	D-Pad / Left Stick

RIN'S SKILLS

Rin's Skills (Starting)

The six core skills of Rin, the player-controlled mage. Values are for the starting state (no upgrades or Memoria).

Normal AttackLeft Click / × No MP Cost

A main attack you can fire anytime. No MP required—it launches auto-aiming magic bolts at enemies within 15m ahead, in a ±45° frontal arc.

MP Cost0

Fire Interval0.45s

Damage~104

Bolt Speed18m/s

Range ~54m (bolt lifetime 3s)
Upgrades add multi-shot (double/triple), pierce, split, and freeze bolts

When to useThe foundation of Rin's offense—keep firing constantly.

Ice NovaLeft Shift / △ 9m radius / 6s freeze

A control skill that freezes a 9m radius around herself. Low damage, but it freezes every enemy in range for 6 seconds and serves as the trigger for Chain Freeze.

MP Cost45

Freeze Radius9m

Freeze Duration6s

Damage~20

Knocks enemies back (no effect on bosses) / no cooldown, MP-based
Upgrades: up to +2m radius, +2s freeze, and MP refund per hit

When to useWhen you want to stop a crowd and set up the finishing chain.

MeteorE ／ R1 3 meteors / 2s burn

A high-damage area attack that drops 3 meteors (one per second) ahead. Impact points burn for 2 seconds after the blast, dealing damage over time.

MP Cost50

Meteor Count3

Blast Radius5m

Burn Duration2s

Blast damage ~165 each, burn DoT ~82 total
No cooldown, spammable / upgrades: up to 5 meteors, +1m radius, +1s burn; ×1.3 power at MP 80%+

When to useWhen you want to burn down clustered enemies all at once.

ShieldSpace ／ ○ 2s Full Block

For 2 seconds, nullifies all attacks completely. Contact, blasts, boulders, even boss attacks are reduced to 0 damage, and ranged projectiles are reflected.

MP Cost20

Full Block2s

Move While Blocking×2

Damage TakenZeroed

Not reduction but full nullification (take no damage at all)
No cooldown, MP-based / upgrade adds +1s duration

When to useWhen you want to tank a boss's big move or a self-destruct head-on.

HealRight Click / □ Heal 35% HP

Heals 35% of max HP to whichever of Rin or Kohaku has the lower HP ratio. Purely healing—no damage.

MP Cost30

Heal Amount35% max HP

TargetLower HP

Cast Time0.4s

Ties favor Rin; if only one ally is alive, that ally
No cooldown / upgrades: up to 50% heal, plus half to the other ally

When to useWhen either ally's HP is running low.

UltQ ／ L1 6s Full Invincibility

An ultimate triggered when the gauge is full. For 6 seconds, Rin becomes fully invincible while auto-firing Meteor and Ice Nova continuously.

Full Gauge60

Duration6s

EffectInvincible

Move Speed×1.2

While active: auto-casts Meteor every 0.4s and Nova every 1s ignoring MP, fully restores MP, and phases through enemies
Gauge builds on kills (+1 minion, +10 elite/boss) / upgrade extends duration up to 10s

When to useFor escaping and wiping out enemies when surrounded.

* Damage values are for the starting state (no upgrades, Memoria, or Adrenaline). They rise as you grow.

KOHAKU'S SKILLS

Kohaku's Skills (Starting)

Skill	Effect
Normal Attack	A fan-shaped slash, 130° and 2.64m radius. Power rises in Attack mode.
Sweep	A 360° attack with 3.6m radius. Twice the power of a normal attack. Costs 40 MP.
Parry (Passive)	Chance to fully nullify incoming damage. Deflects even boss knockdown attacks and self-destructs.
Damage Reduction	Base 10% reduction. Stacks up through command modes, the Guard skill, and upgrades.
Guard Skill	Damage reduction +20% for 3 seconds. Used automatically as the situation calls for it.

Command Modes — Switch how Kohaku fights

Commands don't swap skills—they change Kohaku's very strength and positioning. Switch with the D-pad (gamepad) or number keys (keyboard).

↑ / 1Attack

← / 3Taunt

→ / 4Rescue

↓ / 2Defend

Each mode is bound to one of four directions. Switch instantly, anytime.

AttackDamage Damage ×1.5

Attack-focused: he advances and strikes. Damage dealt becomes ×1.5, and he engages up to 16m from Rin. The most aggressive of the four stances.

Damage Dealt×1.5

Dmg ReductionBase only

Engage Range12m

Distance from RinUp to 16m

Uses no Guard skill—commits fully to attacking
Normal attack 120→180, Sweep 240→360

When to useWhen you want damage output—to maximize Kohaku's damage.

DefendTank Reduction +20% / Parry 30%

Stays near Rin (within 8m) and plays defensively. Damage reduction +20%, and parry chance rises 10%→30%. Guards against approaching enemies.

Dmg Reduction+20%

Parry Chance10→30%

Guard SkillHP ≤50%

Distance from RinUp to 8m

Raises his guard when enemies close within 3.5m
While the Guard skill is active, an additional +20% reduction

When to useWhen enemy attacks are fierce—to hold the line and shield Rin.

TauntAggro Taunt Range ×2

Draws enemy aggro to himself. Taunt range doubles (10m→20m), and he moves up to 20m from Rin to pull enemies in.

Taunt Range×2 (20m)

Taunt Duration4s

Taunt CD6s

Distance from RinUp to 20m

The Taunt skill works in all modes; Taunt mode doubles its range
Guard skill triggers at HP ≤30%

When to useWhen you want to gather enemies on Kohaku and keep Rin safe.

RescueSupport Move Speed ×2

An emergency order to rush straight to Rin. ×2 move speed, phases through enemies, immune to flinch. Prioritizes cutting down enemies near Rin (9m).

Move Speed×2

Enemy PhasingYes

FlinchImmune

Priority TargetNear Rin (9m)

While more than 3.2m from Rin, prioritizes following over attacking
Guard skill triggers at HP ≤30%

When to useWhen Rin is surrounded and in danger—to recall him to her side.

LEVEL UP SKILLS

Level-Up Skills (46 total)

Grow with EXP Orbs

Defeating an enemy drops a glowing green EXP Orb on the spot. Collect them to gain experience, and level up once you reach a threshold. On each level-up, pick one of three skills to strengthen Rin and Kohaku on the fly. Orbs have a pickup range and are drawn in automatically as you get close.

Depending on the order and combination you take, every run yields a completely different build. Even the same skill transforms based on when you take it—that's the depth.

Shared Upgrades (12) — affect both

Skill	Effect	Stacking
Attack Up	Attack +10%	Max 5
Max HP Up	Max HP +10%	Max 5
Max MP Up	Max MP +10%	Max 5
MP Regen Up	MP Regen +10%	Max 5
Regen	Heal 1% of max HP per second	Max 5
Lifesteal	Heal 1% of damage dealt	Max 5
Move Speed Up	Move Speed +25%	Once
EXP Up	EXP gained +20%	Once
Adrenaline	Attack +30% for 5s after a kill	Once
Ailment Slayer	Damage +40% to burning/frozen enemies	Once
Elite Slayer	Damage +30% to bosses/elites	Once
Ult Extend	Ult duration +4s (6s→10s)	Once

Rin Only (26)

Line	Skill	Effect	Stacks
Normal Attack (7)	Double Shot	Fires 2 magic bolts in a row	Once
	Triple Shot	Fires 3 magic bolts in a row *requires Double Shot	Once
	Split	On hit, spawns split bolts (up to 2)	Once
	Greater Split	Increases split bolts to up to 4 *requires Split	Once
	Pierce	Magic bolts pierce enemies without limit	Once
	Desperation	At MP ≤50%, normal attack damage ×1.5	Once
	Frost Shot	Normal attacks have a 20% chance to freeze for 1s	Once
Ice Nova (4)	Ice Nova Radius	Freeze radius +1m (9→max 11m)	Max 2
	Freeze Extend	Freeze duration +1s (6→max 8s)	Max 2
	Chain Freeze	Killing a frozen enemy chains the freeze outward	Once
	Refund	MP +5 per enemy Nova hits (chains count too)	Once
Meteor & Fire (6)	More Meteors	Falling meteors +1 (3→max 5)	Max 2
	Meteor Radius	Blast radius +1m (5→6m)	Once
	Burn Extend	Impact burn duration +1s (2→3s)	Once
	Auto Meteor	Auto-casts 1 meteor forward every 4s	Once
	Ember	Killing a burning enemy leaves magma on the spot	Once
	Full Meteor	At MP 80%+, meteor damage & range ×1.3	Once
Shield (2)	Shield Extend	Full-block duration +1s (2→3s)	Once
Shield (2)	Shield Heal	While Shield is up, heal 10% HP per second	Once
Heal (3)	Heal Boost	Heal amount +5% (35→max 50%)	Max 3
	Sustained Heal	For 10s after Heal, 3% regen per second	Once
	Echo Heal	The non-target ally also heals for half	Once
Dummy (3)	Deploy Dummy	Every 24s, places a dummy ahead (taunts nearby enemies, HP 150)	Once
	Faster Deploy	Deploy interval −3s (24→min 18s) *requires Deploy Dummy	Max 2
	Dummy Explosion	The decoy detonates when destroyed *requires Deploy Dummy	Once
EXP (1)	EXP Orb Range	EXP orb attraction range +30% (max +60%)	Max 2

Kohaku Only (8)

Skill	Effect	Stacking
Blade Speed	Normal attack interval −0.5s (2.0→1.5s)	Once
Extra Strike	Normal attacks gain +1 follow-up hit	Once
Sweep Radius	Sweep range +1m (3.6→4.6m)	Once
Parry Up	Nullify chance +10% (base 10%→max 30%)	Max 2
Flame Blade	Magma forms where an enemy dies, dealing damage over time	Once
Frost Blade	On hit, a small ice blast erupts (3m radius, 3s freeze)	Once
Iron Wall	Damage reduction +10% (base 10%→max 30%)	Max 2
Taunt Radius	Taunt range +2m (10→max 14m)	Max 2

Prerequisite System

Triple Shot appears after Double Shot, and Greater Split after Split. Dummy's faster deploy and blast also require Deploy Dummy. There's real joy in charting your own build path.

Example combos: Split × Triple Shot turns normal attacks into a barrage. Frost Blade × Chain Freeze makes your partner's swing the trigger for a chain.

MEMORIA TREE

Memoria Tree (Permanent Growth)

After every battle, win or lose, the experience from that run accrues directly as Memoria Points. Spend them to awaken the tree's 36 nodes and start each new run reliably stronger.

Branches extend in 4 directions from the central root: up = Rin's basics, down = Kohaku's basics, left = Ice Nova, right = Meteor. At each branch's end waits a special node that lets you start already owning a level-up skill.
* Each node is awakened only once. An end node unlocks only after all preceding nodes on its branch are awakened.
* Restarting mid-run or returning to the title forfeits that run's points.

Up — Rin Basics (5 nodes)

Node	Effect	Cost	Requires
Move Speed	Rin move speed +10%	200	—
Max HP	Rin max HP +5%	300	Move Speed
Max MP	Rin max MP +5%	300	Move Speed
MP Regen	Rin MP regen +5%	300	Move Speed
Attack	Rin attack +5%	500	HP, MP, MP Regen (all)

Down — Kohaku Basics (5 nodes)

Node	Effect	Cost	Requires
Move Speed	Kohaku move speed +10%	200	—
Max HP	Kohaku max HP +5%	300	Move Speed
Max MP	Kohaku max MP +5%	300	Move Speed
MP Regen	Kohaku MP regen +5%	300	Move Speed
Attack	Kohaku attack +5%	500	HP, MP, MP Regen (all)

Right — Meteor Line (11 nodes)

Node	Effect	Cost
Meteor Efficiency	Meteor MP cost −10% (right branch start)	300
Meteor Power I / II / III	Meteor power +5% / +5% / +8% (total +18%)	400 / 500 / 1000
Blast Radius I / II / III	Blast radius +0.3m / +0.3m / +0.4m (total +1m)	400 / 500 / 1000
Burn Time I / II / III	Burn time +0.3s / +0.3s / +0.4s (total +1s)	400 / 500 / 1000
★ Auto Meteor	Start owning Auto Meteor (requires all 9 right-branch nodes)	3000

Left — Ice Nova Line (11 nodes)

Node	Effect	Cost
Nova Efficiency	Ice Nova MP cost −10% (left branch start)	300
Nova Power I / II / III	Nova power +5% / +5% / +8% (total +18%)	400 / 500 / 1000
Nova Radius I / II / III	Freeze radius +0.3m / +0.3m / +0.4m (total +1m)	400 / 500 / 1000
Freeze Time I / II / III	Freeze time +0.3s / +0.3s / +0.4s (total +1s)	400 / 500 / 1000
★ Chain Freeze	Start owning Chain Freeze (requires all 9 left-branch nodes)	3000

Starting-Skill Unlocks (4 extra nodes)

Node	Effect	Cost	Requires
★ Double Shot	Start owning Double Shot	3000	Rin Attack
★ Split	Start owning Split	3000	Rin Attack
★ Flame Blade	Start owning Flame Blade	3000	Kohaku Attack
★ Frost Blade	Start owning Frost Blade	3000	Kohaku Attack

Awakening every node costs 33,200 Memoria Points in total. Which branch to grow first, which ★ to aim for — designing the tree is part of your strategy.