Hajimete no Orusuban  

はじめてのおるすばん

Shiori and Saori are twin sisters who share a secret crush on their "oniichan" neighbor. They recently became interested in learning from him, so they asked him to teach them various things. During the summer vacation, their mother assigned "oniichan" to look after the house and the girls while she was away. With all the free time that came with the summer break, how enjoyable can house sitting be?