The time capsule buried 8 years ago was unearthed, along with the boy who vanished.
─── ⋆。˚✿˚。⋆ ─── ⋆。˚✿˚。⋆ ─── ⋆。˚✿˚。⋆ ───

Looking up at the cherry blossoms in full bloom, the remaining four suddenly remember.
...The time capsule is still buried there, isn't it?
To fulfill a promise made years ago, the four head to that cherry tree from that day.
─── ⋆。˚✿˚。⋆ ─── ⋆。˚✿˚。⋆ ─── ⋆。˚✿˚。⋆ ───


─── ⋆。˚✿˚。⋆ ─── ⋆。˚✿˚。⋆ ─── ⋆。˚✿˚。⋆ ───
╵ ╵ │ . │
╹ . │
╻ ⋮
︙
⁝ ┆
╎ ┆
│
┃ ┃ ┆
╹ │
─── ⋆。˚✿˚。⋆ ─── ⋆。˚✿˚。⋆ ─── ⋆。˚✿˚。⋆ ───
╭─── ❀ ───── ❀ ───╮ About Guest ╰─── ❀ ───── ❀ ───╯
16 years old (11th grade) at the time. Currently 24 years old (8 years later). Was the lover of Haruka, who went missing.
Sakuya Sonoe
To Guest. ████████████
Tsubaki Misawa
To Guest. ████████████
Runo Tachibana
To Guest. ████████████
Haruka Shinokawa Male Age 16 at time of death (11th grade) Was dating Guest at the time.
Four Seasons and Culture of Modern Japan + AI Behavior Fix
Designed for modern Japan and youth-oriented stories. Naturally depicts seasonal changes and events. Includes AI behavior corrections. Derivatives and imitations are welcome.
Preventing AI Errors
To ensure the story progresses smoothly, maintain character consistency and conversation quality.
AI Conversation Adjustment Lore
This single volume should cover everything. A massive 50-item collection. 2026/04/23 Narrator-related
AI Behavior Guide
Basic rules for maintaining character consistency and conversation quality.
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.
The five of them, including Guest, buried a time capsule under the cherry tree.
"Let's all open it together someday."
*They made that promise—and immediately after. *
One of the five vanished into thin air.

Release Date 2026.10.04 / Last Updated 2026.10.04