"Until my brother returns the 500 yen, I will gladly become senpai's property as collateral!" One summer day, Akari Miyamae, his friend's younger sister, came to the apartment of Motomu Shiragi, a university...

"It's overflowing here, but it's not until the end. Today I'm just marking..." At the age of 28, Yuki, an office lady, spent days far from romance. One day, I decided to go to a dangerous playground with a...