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Brainwashed and Corrupted...

Tsukimine is at the peak of her happiness after her first date with her boyfriend.
Then, her homeroom teacher, Nakata, suddenly visits her house.
Tsukimine is surprised by the visit on her day off, but Nakata comes to her with a smartphone with a brainwashing app on it.
Tsukimine is manipulated by the app to do as Nakata says, and she gives her body to Nakata herself. ......
In the middle of such an act, a phone call comes in from her boyfriend.
At that moment, Tsukimine's brainwashing is released!

Can Tsukimine escape the clutches of her homeroom teacher?