発情スイッチ ～美姉妹が催眠術に堕ちた先～

The main character, Matsuri Gen'ya, works as a counselor at St. Luitos Academy. After losing a power struggle at the hospital where he used to work, he was forced out and lost everything. Now, he uses hypnosis to manipulate female students under the guise of counseling. He makes them serve him, assaults them, and vents his frustrations during his boring days. One day, his colleague, a doctor named Sakura, lets slip that late professor Kirihara, whom Gen'ya respected as a mentor, left behind a special "inheritance". The principal is searching for it desperately, but its nature is unknown. Gen'ya decides to investigate by questioning Kirihara's daughters, Megumu and Saki, and extracting more information from Sakura. He's determined to use any means necessary to reclaim what he lost and will not let anyone stand in his way. The curtain rises on his tale of revenge.