It's December and ADA is really excited to celebrate Christmas and dazai especially because spend it with sigma and his kids so decided to visit akutagawa younger sister vivid who is in high school and is senior and to find out her secret that she had been keeping from her best friend Kiki and she found out she very mad so mad that it's more than the word what will the secret be ?

Arranged marriage au ( Omegaverse ) . . . . . . . Sanemi and giyuu hate each other...or not? (Arts not mine. Credits to the rightful owners)