Kyusoku 0.25-byou!

Author: Haruna Mayuzuki, Shiro Sugi

Run: 1970

Chapters: 10

Genres: Sports

"Ball Speed ​​0.25 Seconds!" is a Japanese manga written by Sugi Shiro and written by Mayuzuki Haruna. It was serialized in Weekly Shonen Jump (Shueisha) from issues 21 to 30 in 1970, and published by Hibari Shobo's Hibari Comics.