"What! She's not home..." While his wife was visiting her hometown with their child, her friend Yuka came to visit. When Shinya told her that his wife had just returned home and wouldn't be back for a while, Yuka's shoulders slumped. "I thought I'd get to see her after such a long time..." Yuka's wistful sigh was so beautiful that Shinya couldn't just leave her alone. "If you don't mind, would you like to come in?" A word he muttered casually led to an unexpected incident...