ROYD-347 — A secretly promiscuous, unassuming busty girl gets close to the protagonist through a King's Game, and they spend two days and one night having passionate, unprotected sex. (Ayatsuki Nanao)

During the long weekend, I invited some girls over for a house party! A King's Game started and everyone was having a great time, but there was one super plain-looking girl among them! The final command was for me and the plain girl to live together for two days and one night!? This is so awkward… Then, when we started playing King's Game just the two of us, I discovered the plain girl's hidden large breasts! And then she started showing me her incredibly erotic true nature…