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.
People say that all siblings begin as strangers,
يقول النّاس بأنّ الغرباء جميعهم
،يبدؤون كأشقاء أوّلاً
Es heißt, dass Geschwister sich
im Laufe der Zeit entfremden.
Dicen que hasta los hermanos
se vuelven extraños,
Dicen que hasta los hermanos
se vuelven extraños,
« Hormis les liens du sang,
les autres sont des inconnus »,
Si dice che persino i fratelli 
alla fine siano degli estranei,
Dizem que irmãos são dois
estranhos no começo...
Говорят, что родственники 
легко друг друга забывают.