...Junai no Seinen
Happy yarou 4 and one of my favorites in the series.
Hell and Heaven
There's just too much missing in this story, that it doesn't make sense, and statements made that were never addressed so it seems incomplete. It's cute I guess, but I wouldn't call it really worth reading.
Higouhou Junai
This is a really good story. Although there are so many cliched topics, they are done in a unique, non-cliched way. It's very lite yaoi, but the character and story building was so good and well written that it is still a wonderful story.
Nani Ka Ii No Mitsuketa!
Shitteru Yo.
It's cute, not a lot of character devlopment but a quiet weird boy x fake smiling nice guy plus quiet boys' bro-con brother x his own college crush. It's a fun story.
Breath
Only regret isn't that there aren't many chapters after the main climax. But this is a great one. You really have to pay attention to the flashbacks, the characters not being able to speak, and appreciate the realism. How love is not a relationship, and how people an't change overnight. And to see the true depth, you have to pay attention to everything that was done to him, over his life, to isolate. The mangaka also prefers to say/write less, wants us to understand and get closer without any words.
Utsukushiki Kemono-tachi