- 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!!
Late on night, Shūsuke spots a sexy cosplayer named Ran Yatagai on top of a vending machine. He later sees Ran, who calls herself Princess Leila, at school the next day, who invites him and his friends to the rooftop. She claims to be seeking a saviour amongst the scum of the Earth in order to defend it, with Shūsuke and friends believe to be initiation for some kind of underground club. As Nao and Iroha decide to follow her, they meet her twin sister, Rin, who reveals Ran is using her own peculiar method to find a partner. While Rin manages to scare off the other AGE explorers, Shūsuke goes alone to an ‘awakening ceremony’. Shūsuke is scared off by Nao’s presence and runs off with Ran, who decides he is her saviour. Meanwhile, Rin appears and shows romantic interest in Nao, now that Ran is preoccupied.