Nanami and Sakura are best friends. Nanami is the older sister who is strong and reliable, while Sakura is a reserved but adorable girl who has a huge bust that is disproportionate for her small frame. They are friends at school, but they also have a connection through their families. On her days off, Nanami goes for walks with Sakura’s father, Shouhei, and he treats her like a daughter. This makes Nanami wish he would marry her mother, Kanako. That’s how much she trusts him.