In the D-Frag! series, the Kazama Family, a trio of aspiring delinquents who are inseparable friends, is led by Kenji Kazama, with their goal being to make a name for themselves at Fujou Academy. On their first day, they accidentally discover a fire at the Game Development Club and help put it out. Instead of receiving gratitude, the eccentric club members ambush and incapacitate Kenji's companions, leaving him with no choice but to defend himself and reluctantly join the Game Development Club.
As Kenji adapts to his new circumstances, he meets the four girls who forced him into the club: Chitose Karasuyama, the stern and authoritative student council president; Sakura Mizukami, a lively tomboy; Minami Oosawa, the laid-back club advisor; and Roka Shibasaki, the school's enigmatic underground leader. Despite the club's chaotic environment and Kenji's initial desire to leave, he gradually begins to find enjoyment in his unexpected situation.