Misty Boy

From Mangaupdates:
Suzune never got along with her cousin Yuuma when they were kids. Now that she’s in high school, though, he suddenly shows up again after years of separation, and he’s like a completely different person — he’s become cool and good-looking! Yuuma says that his grandmother told him, “Protect Suzune,” and so now he wants to live with her…!?

Creator:Ikeno Koi
Status: Complete
Genre: Drama, Romance,Shoujo