The manga i?m looking for is about a "young man" ( boy ) who ?s looking for his sister, only know ( a part of her ) name. While he is searching, he found a mansion where an old man ( Grandfather ) with two girls life. The problem is that the two girls have similar names and the picture ( the name of the sister is on the picture ) has a spot on this part of the name so he couldn?t know which girl is his sister. During the story, he is going to live with the girls in the mansion. The two girls falling in love with him but he doesnt know wich one is his sis and so on

I thought the girls names are like aru/maru or aju/maju but i couldnt find the correct title. Perhaps someone knew this Manga?

Thanks for helping!