Easter egg: Click on her pussy.
If you run the game locally, Adobe Flash Player stand-alone player may have strong strobe, please use the old version or other players.
Source(unmodified):Rape Mikuru Asahina 朝比奈みくるの強姦 - Hentai Flashhttps://h-flash.com/rape-mikuru-asahina/
Probably because the flash file version is older and incompatible. The recent new game "なるくんとえっち2" cannot be played with the old version (Adobe Flash Player 11).