After the last time they were in danger of staying in school, the siblings are now safely together.
They live in harmony, sometimes checking each other out.

One day, they decide to take a trip to the beach with a lottery ticket they received when they went shopping. The three sisters are excited about the trip and have a lot of fun.

Sea→Swimsuit→Skin color!　

We can have fun and seduce our brother!
How much more can the older brother put up with such thoughts from the younger sisters?

[Translated from Official Site]