High school student Yuta Asamura begins living with his stepsister Saki Ayase and her mother due to his father's remarriage. Both Yuta and Saki, who hold cautious values regarding relationships between men and women, agree to live with an appropriate sense of distance between them.
After going to an all-girls middle school, 
high school, and college, I can't help it.
بعد ارتياد مدرسة إعداديّة وثانويّة
وكلّية خاصّة بالإناث، ما باليد حيلة
Ich kann nichts dafür, ich war halt
schon immer auf reinen Mädchenschulen …
Es que fui toda la vida
a escuelas para chicas.
Es lo que tiene ir toda la vida
a escuelas para chicas.
Pas ma faute, j’ai fait
toute ma scolarité qu’avec des filles.
Ho sempre frequentato scuole dove
c'erano solo ragazze, quindi c'è poco da fare.
Sempre estudei em escolas
para meninas, por isso sou assim.
Я всю жизнь училась в женских
школах, ничего не поделать.