- 1Wicked Usual Day of a Brother And Sister
- 2Twintail, Attacking Brother and Sister
- 3A Rival Appears! Brother and Sister in Huge Trouble!
- 4If My Little Sister Wore a Swimsuit
- 5Mister X Strikes Brother!
- 6My Brother has Dreams of Black Panty Stockings
- 7My Brother and His Friends' Akiba
- 8Aim for Brother's Top!
- 9Summer! Festivals! Brother and Sister's M:i:V
- 10Brother Saves the World
- 11Calling Out to Brother from the Center of the World
- 12I Don't Like My Big Brother at All!!
While running back from buying a new porno magazine, Shūsuke bumps into another person. They get their packages mixed up and Shūsuke ends up with a Boy’s Love magazine that he immediately rips to shreds. When the other party, known as Mister X, discovers about the mix up, he sends Shūsuke a threatening note demanding its return. That night, when Shūsuke attempts to make an exchange with Mister X using a different BL magazine, with Nao and Iroha stalking him, he learns Mister X’s true identity is that of his class rep, Mayuka Kondō. With the threat of his porn being shredded or shown to Nao, Shūsuke agrees to become Mayuka’s pet, assuming there will be sexual requests involved. The requests start simple, such as buying her a drink or trying her bentō lunch. However, the next evening, Mayuka asks Shūsuke to buy her a more extreme BL magazine she’s too embarrassed to buy herself.