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Age 12

12-sai.

12歳。

12-sai.

12歳。

Spin-off

Cover image for the manga called 12-sai. - Kokoro Diary

Blurhash cover, shown while loading the real one

12-sai. - Kokoro Diary

12歳。~ココロDiary~

MangaUpdates

It seems to be like a notebook for little girls to use it like a diary.