Yui, a shy high school girl, can only find joy in the world of gaming. She doesn't have many friends at school, but she is always immersed in video games and virtual adventures. One day, while playing a game at a nearby park, she coincidentally meets a strange man. He appears friendly and invites her to join him, saying he is collecting interesting retro games.

Seemingly intrigued, Yui decides to follow him home to explore the collection. Here, the man gives her a glass of fruit juice that he claims is a specialty. Yui doesn't hesitate and drinks the whole glass. Immediately after, she senses a strange emotion surging through her body. The feeling is so intense that Yui can't control herself.

When he touches Yui, everything explodes. She starts reacting fiercely, and things that have never happened before suddenly become real. Yui feels like she is living in an unforgettable adventure, where the boundaries between friendship and love become blurred.