Takianna No Honshou Wa S Na No Ka M Na No Ka Ore Dake Ga Shitte Iru.瀧晏名の本性はSなのかMなのか俺だけが知っている。; Takianna no Honshou wa S nanoka M nanoka Ore Dake ga Shitte Iru.; Only I Know Whether Taki Anna's True Nature Is S or M

Magamo Yoshihiro accidentally walks in Anna's room as she was in her leather outfit masturbating in broad daylight. This chance encounter will define an ever changing relationship between them especially as they go to the same school!