The 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.

The Days of Diamond
First tankōbon volume cover
ダイヤモンドの功罪 (Daiyamondo no Kōzai)
Genre	Coming-of-age[1] Sports[1]
Manga
Written by	Ōhashi Hirai
Published by	Shueisha
Imprint	Young Jump Comics
Magazine	Weekly Young Jump
Original run	February 9, 2023 – present
Volumes	8

Plot

Jiro Ayasegawa is a fifth-grader who is immensely talented in sports, but finds only misery in his successes—he desperately wants to make friends in sports, but is ostracized by his peers whenever he outperforms them. Seeing a flyer for the Adachi Bambies, an amateur little league team, he decides to try baseball, with the hope that a team sport like baseball means that everyone is on his side. However, the team coach sees his potential as a pitcher and decides to have him try out for the national teams.

Publication

Written and illustrated by Ōhashi Hirai, The Days of Diamond started in Shueisha's seinen manga magazine Weekly Young Jump on February 9, 2023.^[2] Shueisha has collected its chapters into individual tankōbon volumes. The first volume was released on June 19, 2023.^[1] As of April 17, 2025, eight volumes have been released.^[3]

The series is simultaneously published in English on Shueisha's Manga Plus web platform.^[4]

Volumes

No.	Japanese release date	Japanese ISBN
1	June 19, 2023[5]	978-4-08-892767-1
2	July 19, 2023[6]	978-4-08-892768-8
3	October 19, 2023[7]	978-4-08-892864-7
4	December 19, 2023[8]	978-4-08-893071-8
5	March 18, 2024[9]	978-4-08-893205-7
6	June 19, 2024[10]	978-4-08-893266-8
7	September 19, 2024[11]	978-4-08-893383-2
8	April 17, 2025[3]	978-4-08-893509-6
9	September 19, 2025	978-4-08-893586-7

Reception

The series ranked seventh in the ninth Next Manga Award in the print category in 2023.^[12][13] The series topped Takarajimasha's Kono Manga ga Sugoi! list of best manga of 2024 for male readers.^[14] The series has been nominated for the 17th Manga Taishō in 2024, and placed fifth with 56 points.^[15][16] The series ranked fourth in the Nationwide Bookstore Employees' Recommended Comics of 2024 list.^[17] It ranked 25th on the 2024 "Book of the Year" list by Da Vinci magazine.^[18]