Honoka, my wife, is deeply passionate about hot springs and has been actively blogging to share their appeal with others. Recently, she's been especially dedicated to conveying the joys of onsen through her personal experiences. She had planned a hot spring trip with me, but due to an unexpected work commitment, I asked my younger brother Yuzuru to accompany her instead. Honoka happily agreed, and they set off on their journey. Since then, she's been frequently sending me photos—pictures of the hot spring, their private room, and the luxurious meals they've enjoyed. That night, wanting to hear her voice, I called her, but she sounded strangely uneasy, making me feel uneasy in return. Then came the final photo she sent—one that revealed an unbelievable, shocking truth...