Onee-chan-tachi to Amaama Jukenbenkyou

Yuuki is trying to study for his exams, but his cousin Hinata, who is helping with chores, and student council president Kyouka, who is tutoring him, make it impossible to concentrate. Kyouka decides to give him a study break with some business-like attention, and when Hinata finds out, she begins to sweetly spoil him herself.

The two girls compete for Yuuki's affections, eventually settling on a rotating schedule they call "Dick Duty." As their passions heat up, the test preparation is all but forgotten, and the trio comes together for a happy three-way encounter.