As a ronin student, I lived in a run-down rental apartment. My next-door neighbor was a married woman who always gave me cold looks because I seemed so plain. One day, a strange creature 'G' appeared inside my room. When I tried to get rid of it, I hit my head and lost consciousness. When I woke up, I had somehow transformed into 'G'! What should I do...? But wait—can it really be true that as 'G', I can spy on my neighbor? I immediately start peeping on her, only to discover she's cheating. Once I learn her secret, my revenge as 'G' begins...! But how can I turn back into a human...!?