Koi Days!

A social RPG inspired by Koikatsu, Artificial Academy 2, and Summer Vacation! Scramble. Walk around a stylized anime school campus, interact with unique NPCs, build relationships, and shape your story through meaningful choices.

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Features

Deep Relationship System

Relationships aren't just a single bar that goes up. Every NPC tracks four axes independently: Friendship, Romance, Trust, and Hostility. You can be best friends with someone who secretly resents you, or deeply in love with someone who doesn't trust you at all.

• 25 pair statuses dynamically derived from your interactions, from Soulmate to Nemesis
• 6 relationship stages: Stranger, Acquaintance, Friend, Close Friend, Crush, and Dating
• Confess your feelings, ask NPCs on dates, or break up, with real consequences
• How you treat one NPC can ripple out and affect how others see you

50 Personality Archetypes

Every NPC is built around one of 50 personality types, each with their own dialogue, quirks, and behavior. From Cheerful and Shy to Yandere, Sadistic, Scheming, and everything in between.

• Each personality has a full 10-chapter story arc with branching paths that change based on your choices
• Attachment styles affect how NPCs handle romance and trust
• Fidelity types determine how they react to you dating others
• Love languages shape which actions resonate most with them
• Hidden weaknesses can be discovered over time, unlocking new interactions
• NPCs gradually share personal lore, backstory, and fun facts as you get closer

Rich Conversation System

Conversations aren't just picking dialogue options. You choose actions and the outcome depends on everything: personality, mood, relationship history, where you are, what time it is, and your own stats.

• 40+ actions across 6 tabs: Social, Emotional, Romantic, Contact, Activities, and Gossip
• NPCs remember what you talked about last time and will bring it up
• Push too hard and they'll get annoyed, warn you, or walk away entirely
• Nail a streak of good interactions and they'll warm up, giving you a bonus on your next move
• Each personality has its own dialogue rhythm and voice. Some NPCs speak fast, some hesitate, some drawl

Living World

NPCs don't just stand around waiting for you. They have lives.

• Day/night cycle with 4 time periods (Morning, Afternoon, Evening, Night) and dynamic lighting
• 26 explorable locations across a detailed school campus
• NPCs follow daily schedules, moving between classrooms, the library, the park, the cafeteria
• They chat with each other, argue, flirt, spread gossip, and form their own opinions
• Get caught doing something romantic in front of the wrong person and you'll deal with jealousy, anger, or worse
• NPCs react to your presence in the world. Dating partners approach you. Rivals avoid you. Friends wave from across the courtyard
• A mail system lets NPCs write you letters. Love letters, check-ins, threats, anniversary notes. You can write back.

Character Creator and Card System

Build your characters from scratch or import ones made by the community.

• Full character creator with outfit browsing, color editing, body and face shape sliders, and full personality configuration
• PNG character cards in the style of AA2 and Koikatsu. Your character's appearance and personality are embedded in the image file itself. Export, share, and import characters as simple PNG files.
• 35-slot neighbor selection screen to pick your starting cast before each playthrough
• Custom content support. Model outfits in Blender, export as .glb, and the game loads them at runtime. No Unity required.

Training and Progression

Your character has three stats: Intelligence, Fitness, and Charm. They start at 50 and decay daily, so you need to actively maintain them.

• Train solo at matching locations (library for INT, park for FIT, cafe for CHR) or train together with an NPC for guaranteed results
• Higher stats unlock conversation bonuses and make certain actions more likely to succeed
• Daily and weekly challenges give you short-term goals with money and stat rewards
• 45 trophies across 6 categories track long-term achievements and unlock permanent bonuses
• A daily fortune gives you a random buff or debuff each morning. Some days romance is easier. Some days everything costs more. Some days are just cursed.

Economy

Money matters. You get a daily allowance, but it won't cover everything.

• Shops rotate their stock daily. Different zones sell different items.
• A night boutique opens in the evening with premium goods
• Pick up free flowers in parks, buy gifts at shops, or craft higher-value items at the workbench
• Part-time jobs at 9 locations pay based on your stats
• NPCs sometimes ask you to bring them specific items for payment and trust
• Some NPCs won't advance past a certain relationship stage until you give them the right kind of gift
• You can sell items you don't need at any shop

More

• Photo mode with NPC reactions based on your relationship. NPCs pose, look away, or get angry depending on how they feel about you. Photos are saved to a persistent gallery.
• Gift system with 64+ items across 11 categories, 20 crafting recipes with quality tiers, 50 personality-matched special items, and 10 legendary world pickups with hidden unlock conditions
• Mini-games like Acchi Muite Hoi (a Japanese pointing game) and a rhythm crafting game where your score determines item quality
• Online library for downloading community-made characters and outfits
• Full save/load system with auto-save on every time period change, manual save slots, and a Continue button on the main menu

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Controls

Input	Action
WASD	Move
Right-click + drag	Orbit camera
Scroll	Zoom
E	Talk to NPC
T	Solo training
C	Photo mode
P	Photo gallery
J	Challenges
K	Trophies
G	Location activities
F	Pick up items / Interact

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Tips Without Spoilers

• Pay attention to what time it is. NPCs move around and some conversations go better at certain times.
• If an NPC keeps deflecting your actions, you might be pushing the wrong axis. Try a different approach.
• Hostility isn't just a punishment. Some pair statuses only emerge when things get messy.
• Check in on NPCs you haven't talked to in a while. They notice when you disappear.
• The mail system isn't just flavor. Some letters hint at things you can act on.
• Not every personality responds to the same gifts. Watch how they react and adjust.
• Training stats aren't optional. High charm opens doors that no amount of clicking will.
• If an NPC walks away from a conversation, give them space. Come back tomorrow.
• Fortune buffs can stack with location bonuses. Plan your day around what you rolled.
• NPCs talk to each other. What you do in front of one person can become gossip by the next period.