Rin, her best friend, consulted her about her husband's cheating habit, which just won't change. No matter how much she tries to reason with her husband, he just keeps making excuses. Rin gives up and rushes to find the reason for his cheating. "What? Women are attracted to you because you have a big dick and are good at sex? Come on, stop joking." There's no way that could happen. The reason for his cheating is too unrealistic. However, as Rin tries to laugh it off, her body starts to ache when a very impressive penis appears in front of her eyes...