Osananajimi no Imouto no Kateikyoushi wo Hajimetara Soen Datta Osananajimi ga Kowai (WN)

His childhood friend Takanishi Aisa is a popular beautiful girl even when the two were in school.

It’s not a surprise that they now are estranged.

But, Aisa have only had eyes for Kouki…?

As Aisa’s younger sister Manami’s home tutor, the two once again come into contact.

It’s a romantic comedy about the unfriendly class idol Aisa and Kouki who is afraid of that cold attitude.