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Okaa-san (10-sai) to Boku.
おかあさん（10さい）と僕。 · おかあさん じっさい と ぼく
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
Haru-kun is a transfer student who moved into a new town with his mother. One day his mother suddenly turned into the same age as him.
Source: AniList
External databases: MADB · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections
Volumes
このマンガがすごい!comics First edition
1vols · 2017-05
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