Finished romance?
Ai Ren*
Natsu no Zenjutsu*
Balance Policy
Coulomb Fille
Hoshikawa Ginza Yonchoume* (forbidden love, teacher student. Godlike)
Koe no Katachi* (Although it ends with bullshit, with that last-chapter bullshit you mentioned, but worse)
Koi Kaze* (Bro sis loli love. Classic)
Me-Teru no Kimochi (NEET loves his step-mom, goes full retard)
Mon Seul (Guy reveals he's been "dating" his best friend's little sister.)
Sundome
Watashitachi no Shiawase na Jikan* (Classic shoujo romance)
Onnanoko ga Shinu Hanashi* (Sadness: the manga)
Whoops, didn't see you wanted comfy. Stuff with an * is pretty comfy. Also Ore Monogatari.
Enjoy.