Custard Cream Taiyaki

One day while returning home, Raikou gets in trouble and meets his childhood friend Aira who he hadn’t seen since he was small. He wondered why she came back and she said that she has an arranged marriage with him, however she just wants to keep her promise with him. The next day, Aira transfers into his school and announces to everyone that she’ll be marrying him, which surprises everyone since no one knows of their relationship. Aira moves in his house, as well as Kanae and Ayaka, since they find Aira too suspicious.