Ore no Nee-chan to Tenkousei ga Erokunatta Wake

True love and school life simulation with an immoral dilemma.
Freely enjoy the time between Golden Week holiday and Summer Vacation.

Daily life was peaceful but busy:
You were deeply involved in school, and were dating a transfer student.
Then you had that sweet, dangerous night with your sister.

The secret thrill led to another incident. And another.
Each day the perversion escalated a bit more.

Two heroines, two lives and developments.
Forbidden incest and a dream school life.
Which will you choose?

[From DLsite English]