Doukyuusei (NAKAMURA Asumiko)
Definitely a classic! Deeply skeeved by the behavior of the teacher, but otherwise a really cute story with really cute MCs. A little non-eventful as a standalone, but there are sequels/follow up vignettes. The trouble is they're hard to find because so many of the author's characters look like Rihito and I have no idea what the actual order is. I may buy these, but in the meantime just look up by author and flounder, I guess! Sequels: Setsugyousei ; Occupation to Beloved Spin-off with creepy teacher and a different high school boy: Sora to Hara
Sotsugyousei
Sequel to Doukyuusei Again, I just wish there wasn't so much (or really, any) of the creepy teacher. The MCs are cute. It's wild to me that people liked the teacher so much that he got a spin-off. Up next: Occupation to Beloved
Gosan no Heart