 If you liked
Kokou no Hito
|
 ...then you might like
Usogui
|
Both have surreal artstyles that really improve throughout their run, with examples of the most beautiful and creative panels I've seen in the medium.
Moreover, while their themes aren't similar at all (gambling vs sports manga), they are both standouts of their respective genres, and both their protagonists are lonely (although in Usogui it's much less relevant than in the Climber).
Oh, and neither has anime.