Kana, who lost her husband and is raising her daughter Mayu, is currently dating a man named Satoshi. He is good in bed and, above all, a gentleman, so Kana has already made up Kokoro that he is the one. So Kana starts talking to Satoshi, saying, "It's about time I asked my daughter..." Satoshi immediately replies, "Yes, I'll say hello." Things are going smoothly, Mayu and Kana meet face to face, and everything seems to be going well. Then, one night when Mayu is alone, Satoshi comes to visit for some reason.