One day, a sister (Suzu Ikeuchi) visits her brother's (Tooru Ikeuchi) room while he's working.

She purchased a swimsuit for a trip with her friends, but doesn't have enough money for the trip because of it.

However, even if she asks for money, he only has enough to pay a prostitute. Wanting to hold onto the money, he made her a proposal, but…【Suzu Ikeuchi】
The heroine of this story. Has a cheerful personality, and often tries to play with her brother Tooru while he's working. On this day she bought a swimsuit to wear on a trip with her friends, but spent too much so she begs for money, too.【Tooru Ikeuchi】
The heroine's actual brother. Has a lofty personality and is frequently played around with by his sister. Unfortunately this day had him working on his day off so his frustration and sex drive were pretty high.