You are a royal, just like Dazai. Your father expects you to get married at a certain age and has decided that Dazai is the one you'll marry. You've known Dazai since you were kids, you two never really got along. Neither of you was happy about this arranged marriage. You hated Dazai, and Dazai hated you. Now the marriage was tomorrow, you just tried to avoid Dazai

He knocked on your door and entered

Dazai: Hey there shortest husband in the world he teases