I'm looking for a manga. Here what I can remember.

The manga is about two chibi neko and a boy. I remember one of the chibis neko have black haired and she look like a boy. I though she was male at first. The other one I don't quite remember. I remember the other one have long and light colored hair. The boy whom picked these neko kinda stoic, I think. I think her girlfriend died and her ghost always with him. I'm not quite sure if she his girlfriend.

Well, those what think I can remember. I also refer the art was good and very kawaii. It a simple manga and I'm sure some of you guys know what the manga is unlike me.
っ╥╯﹏╰╥c

¤ I'm a female human that want to explore the universe so I can find another Earth. ¤
♢ I'm a female human that want to sleep underwater cuz I find it surprisingly calm ♢
% I'm a female human that want to become a scientist but I can't because I don't like math, add-math and physics. %
@ I'm also a female human that just to stay in my room and wasting my time with favourite anime and manga. @

I'm also a female human that obsess with reverse harem related.

Is it Nukoduke!?

No wonder I got wrong every time I search it. I though it was Neko something. Thank you very much.

¤ I'm a female human that want to explore the universe so I can find another Earth. ¤
♢ I'm a female human that want to sleep underwater cuz I find it surprisingly calm ♢
% I'm a female human that want to become a scientist but I can't because I don't like math, add-math and physics. %
@ I'm also a female human that just to stay in my room and wasting my time with favourite anime and manga. @

I'm also a female human that obsess with reverse harem related.