Early in the afternoon on a certain holiday, after club activities had finished.

The protagonist Minato got invited to the house of a girl named Tamaki, who he got along with.
Once he entered her room, she promptly pushed him down on her bed, but then her mother Shiori barged in on them.

Minato thought he was going to get scolded for his improper friendship with her daughter, but then her mother said, "Mommy wants to fuck you too!♥" as she snuggled closer to him!

And now Minato finds himself sandwiched in the middle of a sex appeal contest between mother and daughter.
Who will he choose after savoring the taste of a mother-daughter threesome!?

(Source: Melonbooks)