What is this kind of style of manga/comics?

It's not really a style. It's just the stage where manga artists have not finalized their characters and scenery so it looks additionally sketchy and loose. Most artists will refine their lines more for their final artwork, but some, such as Oku Hiroya may choose to purposely leave them to create an edgy, more "raw" feel.

I'm not sure if this is exactly what you're looking for, but here are some artists that I think might be similar:

Imperial Boy(incredible scenery)

D.K (draw girls and mecha) http://mypage.naver.co.jp/flowerss/

MAXX(fantasy and game characters) http://maxxsoul.com/

wow that the guy above me became into so propose calling u an american wishing to be japenese. sheesh what a jerk. besides in the event that they're gonna celebration how approximately "Celestial Love" positioned greater info up and that i'll edit my answer