What Should I Do When My Cosplay Setting Comes True?

Tsushima Shuji is a cosplayer. Since he shares Osamu Dazai's real name, his cosplay group picks him to cosplay as the Boss Dazai. Following the rule that cosplayers transmigrate, Tsushima Shuji naturally transmigrates on the day of the convention. As soon as he arrives, he somehow ends up having a one-night stand, without even knowing who the other person is. After him, his brother-obsessed younger sister also transmigrates by cosplaying as Izumi Kyoka. Three weeks later, Tsushima Shuji is told he's pregnant. Tsushima Shuji: I regret this so much. I shouldn't have given myself the setting of being an Omega. Izumi