Clear Skies!(2000)

A typical summer night turns hotter than usual at the Obinata household when a stranger named Shuu Asuou turns up and announces that he’ll be living with them from now on! Shuu explains that he has married their sister Shima and that he shall stay at the house while awaiting her return. But when she doesn’t turn up, he proclaims that he is there to stay for good! What is Shuu's motive for wanting to be with Obinata family?

(Source: Juné)