Kinokoinu Mushroom Pup
Kinokoinu's Sibling (1x7)
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Turns out Plums is Kinokoinu's sibling formed from its spores. Plum lives with Anzu and her mom, Tsubaki.
Tsubaki used to tease Hotaru in elementary school and is also a picture book author.
Hotaru decides to get a cell phone after years of refusing.