A kiss with the flavor of black tea that brings happiness. A love story between a working adult and a student.

It all started when my older sister decided to move abroad. My sister, who has one daughter, was cheated on by her husband several years ago and is now a single mother. My sister discussed it with her one daughter and let her choose whether to stay in Japan or go abroad with her. The daughter chose to stay in Japan. And that daughter came to stay with me, my older sister's younger sibling.