Futago to Sensei

Known as the 'Ariya Brothers,' high school twins Ariya Ruri and Ariya Sui. Both strikingly handsome with frighteningly similar appearances. ―― The subject of their gaze was the classic literature teacher, Kei Usami. Usami alone could distinguish between Ruri and Sui. Usami alone understood Ruri and Sui. The relationship among the three of them had gradually become something special.