A manga adaptation, illustrated by Idumi Kirihara, was serialized in Futabasha's Monthly Action from September 2017 to August 2018.

The plot follows a grade schooler, Nanoka Koyanagi, after she is assigned at school to define what happiness means to her.

[4] A manga adaptation, illustrated by Idumi Kirihara, started serialization in Monthly Action on September 23, 2017.

[3] Demelza from Anime UK News praised the novel, calling it a "compelling read from start to finish".

[11] Rebecca Silverman from Anime News Network praised the manga adaptation for both its story and characters, while calling it a bit predictable at times.