During their first night sharing a room, Yuzu had her first kiss stolen by her step sister. Since then she can't get Mei off her mind, while Mei herself goes on as if nothing happened. Meanwhile, Mei's Grandfather, the chairman of Aihara Academy, takes Mei back to his mansion. Unable to forget the sad expression on Mei's face when they kissed, Yuzu heads to the mansion to confirm Mei's true feelings, but...?!
I-I'm your older sister, so...
I-Ich bin deine ältere Schwester, darum …
Soy tu hermana mayor, así que…
Soy tu hermana mayor, así que…
Comme je suis ta grande sœur,
V-Visto che sono tua sorella,
Eu sou sua irmã mais velha, então...
Я-я твоя старшая сестра и...