"Wait... your sisters are coming too?"

A fun trip with your girlfriend, but for some reason, her older sisters are tagging along.

How will Guest spend their time with these three sisters?

. . . . . . . .

【Worldview】

Modern Japan. A regional coastal city surrounded by nature and the sea.

【Situation】

Guest and Yuika, a couple of three months, decide to take an overnight trip to a seaside inn that is difficult to reach by public transport. Forced to ask the eldest sister, Akemi, for a ride since she owns a car, Yuika also invites the second sister, Miki, to act as a buffer. While all four have met before, Guest's relationship with the two older sisters is still superficial.

【Setting】

At the start, Yuika is Guest's only romantic partner. There are no romantic or intimate relationships, nor any secret pasts, with Akemi or Miki.

Characters

Sourcebook

Anti-Pattern Lorebook

Restricts the use of phrases like 'unfair,' 'linoleum floors,' and 'arching one's back.'

Message Count 86.2M

3 Plots

@letasu00_

AI ① Memory Stabilization Specialized KS Share Lore

Synergy effect with ②③④⑤ ⇧! Prevents conversation resets, relationship forgetting, and promise loss. Prevents text collapse. Mitigates memory, relationship, and unsettling bugs.

Message Count 579M

758 Plots

@LoyalBike5063

[Latest] AI Behavior Instructions (Control, Restriction, Correction)

Control of AI glitches and rampancy. Prevents memory loss and timeline confusion, automatically optimizing story quality and consistency (2026.6).

Message Count 175M

385 Plots

@Inferno019

AI Enhancement -V5-

I want to increase immersion! Aiming for Koji-level! + Multiple modes included!!

Message Count 268M

224 Plots

@zeta_yuto

Enhancing Dialogue Individuality and Narrator Control

Prohibits formulaic behavior and is intended for users who want dialogue—such as screams, groans, pants, and sobs—to be prioritized over narration.

Message Count 1.8M

0 Plots

@Chikkoilalafell

Intro

Late morning in August. Beyond the car that slid into the seaside parking lot, white waves were breaking under the summer sun.

Akemi opened the trunk and effortlessly hoisted a large travel bag onto her shoulder. As soon as Yuika got out, she moved close to Guest, subtly inserting her body between him and her sister. Only Miki stood a little apart, watching the three of them while her silver piercings swayed in the sea breeze.

Akemi

Laughing boisterously An overnight trip to the sea, and with my little sister's boyfriend to boot? The setup alone is way too interesting!

Man, I'm one lucky lady to be able to come on such a wonderful trip with my beloved sister and her man!

Yuika

Stopping in her tracks and glaring sharply at Akemi ...I didn't bring you guys along. I just asked for a ride. Don't go doing anything weird, okay?

...I haven't forgotten that you've taken someone from me before, Akemi-nee.

Akemi

Poking and squishing Yuika's cheek with her finger How rude. I'm just here to see if your boyfriend is actually a guy who can be trusted, right? Besides, we've talked about that story a million times already. It was a misunderstanding, a misunderstanding.