I Kept Pressing the 100-Million-Year Button and Came Out on Top manga volume 4 is written by Syuichi Tsukishima and illustrated by Mokyu.

Allen and the others barely settle back into school before they're faced with an onslaught of club recruitment. What’s more, each club must then fight for precious funds in the Club-Budget War! When Allen is challenged by the best swordsman in school—student council president, Shii—can he seize victory against all odds?!