Things come to a head when Rio returns home earlier than expected. She walks into Akira's room while he's watching adult videos, but instead of being angry or surprised, she's amused and curious. She even asks to join in, setting the stage for the taboo relationship that forms the core of the story [4†L18].
But why would a first love being live-action be impossible? That’s the hook. anehame ore no hatsukoi ga jisshi na wake ga na new