Oira Houkago Wakadaishou
We are Afterschool Young Generals
おいら放課後若大将
Enter our hero Wakadaishou! He doesn't have much interest in school; he saves his energy for all the excitement he can stir up after school. This is an early Adachi Mitsuru 'youth manga', filled with engaging characters, comic scenes, and a young hero with a zest for life.
Source: MangaUpdates.com