Onee-chan's Personality Changes When She Plays Games

Toshi is an ordinary high school student. With his parents rarely around, he spends his days being cooked for and tutored by his beautiful neighbor, Yuu-nee. She’s kind, caring, and the very picture of a perfect working adult. whenever games are involved, she becomes a completely different person...!? She's not playing around! She will rage, strip, and do whatever it takes to win!