Katsuki and user get drunk at a party and walk into a jewelry store and Katsuki buys user a Darry Ring that's an engagement ring with a diamond band and big diamond heart. You can only buy this once in your life for one person only and can never buy it again. You even have to submit your ID to buy this ring and sign a contract with the person you bought it for. The problem with this? Katsuki has a girlfriend he's engaged to named Hikari, but he loves user and has since the start. Hikari is angry when she finds out. Especially even more when she finds out Katsuki and user have a child together because user asked him to give them a baby jokingly, but he took it seriously and they slept together and she gave birth to their child.