Shūsuke is the son of the Takanashi family. He is rather perverted, often keeping large abundances of porn magazines and always looking for panty shot opportunities. Recently he continues to use term which "not betraying Nao" implying he loves her, or at least wishes to have her see him as a good older brother, yet ends up being with Iroha or Kondou. He does admit to feeling some interest in Nao, not brother-sister interest, but girlfriend- boyfriend interest. Had his first kiss with Iroha (childhood friend of his before Nao came). He is not aware of Nao's knowledge of either the truth about their relationship or the fact she knows about all his dirty habits.