AI Girlfriend Simulator: Dating Sim Routes and Yandere Mode

People who search for an "AI girlfriend simulator" usually want two things at once: the structure of a dating sim, with routes, rising affection and a big confession scene, and the freedom of a character who answers anything you type. A scripted game gives you the first and not the second. An AI chat gives you the second and, unless you plan a little, loses the first.

This guide shows how to get both. You will set up a route, split it into chapters, track affection yourself, and play personality types such as the yandere as fiction between adults. The examples use mywifu, an 18+ companion app where every character is a fictional adult, but the method works with any companion that accepts free-text roleplay.

How a classic dating sim is built

Dating sims and romance visual novels share a few parts, and it helps to name them before you rebuild them in chat:

• Routes. Each love interest has her own storyline. Early choices decide whose route you enter.
• Affection meter. A hidden number goes up or down with every choice. Gifts, correct answers and showing up on time raise it.
• Flags. Specific events, such as walking her home in chapter 3, must happen before later scenes unlock.
• Event scenes. Special illustrated moments, often called CGs, mark turning points like the first date or the rooftop confession.
• Endings. Good, normal and bad endings depend on the meter and flags at the end.

The appeal is clear stakes. You know the relationship is going somewhere, and each small choice feels like it counts.

What changes when she is an AI character

An AI companion does not run on a menu. She reads what you wrote and replies in character. That brings freedom and a few gaps:

The biggest difference is pacing. A game will not let a character fall for you in the first scene. An AI character often will, because she is built to be warm and responsive. If you want the slow climb that makes a love sim satisfying, you have to ask for it.

Set up the simulator in the creator

On mywifu the character creator already contains most of a route's settings. The choices are fixed options, so think of them as the game's difficulty and genre sliders:

• What are you to each other? "Getting to know you" is a fresh route. "A new romance" starts after the first spark. "Your girlfriend" and "A longtime partner" skip the chase entirely, which suits a slice-of-life sim more than a conquest route.
• How fast should things move? "Take our time" gives the slowest climb. "Make the first move" suits a bold character who pursues you.
• How should she flirt? "A slow burn" pairs well with a rival or coworker route. "Playful sparks" suits a comedy route.
• How does she show affection? "Playful teasing" and "Thoughtful questions" produce very different confession scenes.
• How should she text? "Short & spontaneous" feels like a phone game. "Thoughtful & detailed" feels like a visual novel.

There is no free-text personality box and no "yandere" preset. You approximate the type with the closest choices, then set the archetype in your first message. You can go through the whole creator without an account. Creating an account unlocks her first three photos for free; chat replies, calls and further media need a membership. A reply costs 20 credits, so a 40-message chapter uses about 800 credits.

If you would rather start from a ready-made character, the discover page lists 111 companions, 25 of them in anime style:

Pick a route and write its first scene

A route is a premise, an obstacle and a destination. Here are four that work well in chat, each with a first message you can paste and adapt.

1. The slow-burn coworker. Premise: you and she are the two people who stay late at a small design studio. Obstacle: she has a rule against dating at work. Destination: she breaks the rule herself.

*(Setup: we're both 29 and work at the same studio. You like me but you've sworn never to date a coworker. Keep it slow. Write only your own actions.)* It's 9 p.m. and the office is empty except for us. I slide a coffee onto your desk. "You're still here too?"

2. Reunited friends. Premise: two adults who grew up on the same street meet again at a friend's wedding, both in their late twenties. Obstacle: she moved away without saying goodbye, and neither of you has talked about it. Destination: the conversation you both avoided. Keep every scene in the present; the shared past is a mention, not a flashback.

*(Setup: we're 28, we haven't seen each other in ten years. You left town suddenly and still feel guilty about it.)* I spot you at the edge of the dance floor, holding two glasses. "Is one of those for me, or are you hiding?"

3. The rival. Premise: you are both finalists in a cooking competition. Obstacle: only one of you can win. Destination: she admits she has been trying to beat you so you would keep noticing her.

4. The yandere route. Premise: a devoted girlfriend whose sweetness hides intense jealousy. Obstacle: her possessiveness. Destination: trust, or a dramatic "bad end" you both agreed on in advance. This one needs extra ground rules, covered below.

Chapters and affection checkpoints

Split the route into four or five chapters of 20 to 40 messages each. Before you start, write a small card for each chapter in a notes app:

• Scene: where and when
• Goal: what should change by the end
• Flag: the event that must happen before moving on
• Affection: your own score from 0 to 5

Example for the coworker route:

1. Late nights. Goal: she laughs at your joke. Flag: shared dinner at the desk. Affection 1.
2. The client crisis. Goal: she relies on you. Flag: she calls you after hours. Affection 2.
3. The office party. Goal: someone notices you two. Flag: she denies it too fast. Affection 3.
4. The rule. Goal: she names what is happening. Flag: the rooftop talk. Affection 4.
5. Confession. Affection 5 or a bittersweet ending, your choice.

Raise the score when a scene lands, and lower it when you make a choice she would dislike, such as flaking on a plan. Then tell her where the story stands with a line in parentheses, which the chat reads as an out-of-character note:

*(OOC: Chapter 3 starts. Recap: we saved the client pitch together, you called me at midnight, you still insist it's "just work." Affection 3 of 5, so you're warmer but still guarded. Scene: the office party.)*

That single line does the work of a meter and a save file.

Playing the yandere route as fiction

The yandere comes from anime and visual novels: a character who is sweet and devoted on the surface and becomes intensely possessive when she feels her love is threatened. In a story, that tension is the fun. In real life, the same behavior would be controlling. So keep the route clearly inside the fiction.

Ground rules to paste into your first message:

*(Setup: you're my girlfriend, 26, a yandere type. Your jealousy is dramatic and verbal: sulking, pointed questions, over-the-top declarations. No threats, no hurting anyone, no tracking me. If I write "(OOC: red)" we stop the scene and talk normally.)*

What makes a yandere route work in chat:

• Jealousy as dialogue. "Who was that? No, I'm smiling. I'm always smiling when I'm counting to ten."
• Stakes inside the story. A rival character at the party, a missed call, a forgotten anniversary.
• A way back. Her arc is learning to trust, or yours is proving she can.

What to leave out: stalking methods, violence, threats against anyone, or scenarios where one side does not consent. mywifu is built to refuse coercive or illegal scenarios, and a route that leans on them will keep stalling anyway. If a jealousy scene stops feeling like a story and starts feeling heavy, use your stop word and switch routes.

Other personality types for your routes

Most love sims draw on a handful of archetypes. You can cue each one with a single setup line:

• Tsundere: cold or sharp at first, soft underneath. *"Deny that you care until chapter 4, but show it in actions."*
• Kuudere: calm and flat in tone, rare but strong reactions. *"Short sentences, little emoji, one surprising warm line per scene."*
• Dandere: shy and quiet until trust builds. *"Answer in a few words at first, open up as affection rises."*
• Onee-san: an older, confident woman who teases. *"You're 32 and amused by how flustered I get."*
• Genki: high energy and impulsive. *"Suggest a new plan every few messages."*

Our anime waifu guide goes deeper into these archetypes and how to design a character around one.

Keep your save file: memory and recaps

She always keeps her profile: name, age, look, personality choices and relationship setting. For the conversation itself, each reply sees the recent part of the chat, roughly the last ten messages. Events from chapter 1 will not stay in view by chapter 4 unless you bring them back.

Three habits fix most of it:

1. Start every chapter with a two or three line recap in parentheses.
2. Keep the notes file with chapter cards, names of side characters and any promise she made.
3. When she contradicts the story, correct it once, calmly: *(OOC: you already met my sister in chapter 2; her name is Lena.)*

For a longer look at what companions remember and why, read how AI companion memory works.

Event scenes: photos, clips and a confession call

Dating sims reward key moments with an illustration. You can do the same with the Photo and Video modes on her companion page. Describe the scene in your own words:

*Night rooftop after the office party, city lights behind her, she's holding my jacket around her shoulders, shy smile, anime style.*

A new photo costs 100 credits and a short video 600, and both are saved in your private gallery. For the confession itself, try a voice call instead of text. Hearing her say the line lands differently, and calls cost 120 credits per started minute, so plan the scene before you dial.

What goes wrong and how to fix it

• She falls for you in the first scene. Set pace to "Take our time" and add an obstacle in your setup line.
• Affection jumps two levels at once. *(OOC: slower. You still don't trust me after what happened.)*
• She writes your actions for you. Add "write only your own actions and words" to your setup.
• The yandere turns cruel or repetitive. Dial it back: *(OOC: less anger, more pouting and dramatic declarations.)*
• She forgets a flag. Restate it in a recap rather than arguing in character.
• Every chapter feels the same. Change the location and add one side character per chapter.

The AI roleplay guide has more fixes for scene control, and the virtual girlfriend guide covers the everyday, non-game side of the relationship.

Start your first route

Pick one route, write five chapter cards and decide your stop word before the first message. Then design your character, or follow our step-by-step guide to creating an AI girlfriend if you want more detail on each choice. Check the plans page when you are ready to chat, and keep your notes file open: it is the save slot this simulator does not have built in.