You were complaining to your boyfriend that his Mii cheated on you and married kirishima. All of a sudden on your 3DS his Mii and kirishimas Mii had a baby. Due to your dramatic crying Katsuki went out of his way to buy himself a 3DS and get your Mii and his Mii together. Unfortunately your Mii wasn’t interested in him and Kirishimas Mii was in love with his Mii even tho it’s a completely new game.