Oji to mei: Fushidara na yokujô (1999)

Satsuki, a university student, is spending her summer vacation at the rural home of her uncle, Kishida. Kishida lost his wife years ago and lives alone, making his living as a farmer. Although Satsuki and Kishida shared a bond akin to that of lovers, neither could bring themselves to take the final step in their relationship. Amidst this situation, Satsuki begins dating a young man named Tamura, while Kishida agrees to an arranged marriage meeting with a woman named Rieko. However, Satsuki is devastated to learn that Kishida has slept with Rieko, and in a moment of emotional turmoil, she ends up sleeping with Tamura herself...