The series plunges back into Shuuichi Sugiyama's chaotic school life as he's relentlessly pursued by his stepsister Mio and the clingy Ai Saeki. Their plans for a school festival cosplay café are upended with the arrival of a stunning and assertive new transfer student, Maya Kamiwazumi, who immediately sets her sights on conquering Shuuichi. The 'service' escalates as Maya challenges the other girls, leading to a series of intensely carnal encounters designed to prove who can pleasure Shuuichi the most. The rivalry ignites a fuck-fest of competitive oral sex, group encounters, and public displays, with tennis club president Reiko Date Wingfield also joining the fray. Each girl uses her body as a weapon, from Mio’s incestuous desperation and Ai’s devotion to Maya’s aggressive and skilled fucking and Reiko’s mature dominance. The episodes are a raw depiction of their sexual warfare, where every encounter is a battle for ownership of Shuuichi’s cock, pushing him through a gauntlet of non-stop orgasms and hardcore sexual scenarios until a clear victor in this pornographic contest is crowned.