In Eimi's 5th Grade class, the boys play monster-catching games while the girls are obsessed with mobile social games. Eimi, whose strict parents refuse to even give her a cell phone, shuns such childish interests. In reality, she has secretly built her own gaming PC for the sole purpose of playing "Megalopolis Knockdown", a new R-rated ultraviolent online RPG that has taken the gaming world and tabloids by storm. Pretending to be 18, she throws herself into the bloody, kid-unfriendly world of MegaKnock, butting heads with griefers, crossing paths with streamers, and maybe even making friends along the way.