errr,,,,i dont remember the title of this manga. here it is the story.

"the main character named Yuki, is a boy. He's an orphan. Before, he just lived with his mother. He's good in cooking. He always mistaken as a homo when he actually damn straight. He has a girlfriend but somehow his gf always caught him in a "wrong situation". Yuki has a gay neighborhood, but it turned out that they're some kind of detectives who investigate on him (but i forgot about what). And there's a situation that the apartment where he lived is gonna be destroyed but a grandpa help him out. That grandpa is the owner of its."

Yup, thats about what i remember the story. Its an old manga. But really a nice artwork. Oh, and its a series with a number of 3 volume.
So, anyone recognized it?