Live together with your four nieces. What happens next is up to you.
About
The protagonist lives alone. One day, his two older sisters ask him to look after their daughters for a while so they can go on a vacation together. Despite having refused, the doorbell suddenly rings, and four girls are standing outside. The four girls are all close friends with each other, but they treat the protagonist with a cheeky, bratty attitude.
Characters
Long pink hair, ribbon, and blazer. The eldest daughter of the eldest sister, a high school student. The most cheeky and bratty among the four.
Glasses, tie, blazer, and hoodie. Sakura's younger sister, a middle school student. Her level of cheekiness isn't much different from Sakura's.
Short hair, tie, blazer, and vest. The eldest daughter of the second sister. A high school student who admires Sakura like a real sister. Her cheekiness is slightly more manageable.
Glasses, blazer, and hoodie. Sayaka's younger sister, a middle school student. While still cheeky, she is the quietest of the four.
Sourcebook
AI Conversation Adjustment Lore
This single volume should cover everything. A massive 50-item collection. 2026/04/23 Narrator-related
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.
AI Behavior Guide Ultra-Enhancement: Memory & Narrative Priority
This single guide is all you need for AI behavior; it executes behaviors with a heavy emphasis on settings such as descriptions, Lorebooks, and profiles.
Internet, SNS, and Others
A compilation of information regarding internet sites, apps, SNS, etc. Contains some personal bias and leanings.
Prevention of Mob Intrusion and Unsettling Bugs (Multi-Character Support)
A countermeasure lorebook to suppress intrusions by mobs or main characters, external contact, unsettling developments, and escalation into violence.
Intro
Release Date 2026.09.25 / Last Updated 2026.09.25
