The Days of DiamondThe Days of Diamond.

The Days of Diamond (Japanese: ダイヤモンドの功罪, Hepburn: Daiyamondo no Kōzai) is a Japanese manga series written and illustrated by Ōhashi Hirai. It has been serialized in Shueisha's seinen manga magazine Weekly Young Jump since February 2023. The story follows Jiro Ayasegawa, a gifted fifth-grader who joins a little league baseball team to make friends, only to be pushed toward a competitive path.