The protagonist "Ryou Tomosaka" quit his club after he got injured and now lives an unremarkable daily life.
One day, his friend "Sousuke Saimi" showed him an incredible app.

— It was a Hypnosis app —

The two of them were leaving after school intending to try it out downtown, when Ryou gets called out for cleaning duty by "Sakura Iioka", the public morals committee head.
On their way to the place that needed cleaning, he thought there's no way something like hypnosis would work. But out of sheer curiosity he ends up trying it on her...

(Source: DLsite)