When Hiro opened the bathroom door, he froze in shock. Before him stood Natsumi, his mother's friend, caught in the act of peeing. Natsumi had been staying at his place to look after him while his parents were away on a trip. An awkward tension hung between them, but for Hiro, there was an even greater issue—he couldn't suppress the intense arousal he felt seeing her. Meanwhile, Natsumi, dissatisfied with her failing marital sex life, was struggling with overwhelming sexual frustration. Left alone together in the house without his parents, their unexpected encounter brimmed with nervous excitement and mounting tension.