Tomodachi to Jikken Shite Miru Hon. Zenpen | A book about experimenting with your friend, part one

Tomodachi to Jikken Shite Miru Hon. Zenpen | A book about experimenting with your friend, part one cover

[毛糸の森 (うーる)] 友だちと実験してみる本。 前編 [英訳]