Golden Days
Mitsuya is forced to travel back in time to undo his grandfather's life long regret. On the way, he falls in love with his grandfather's best friend; the boy he had to take care of (Jin). A bittersweet story.
Monochrome Factor
Akira is the heir to the shadow world, but he's yet to find out. Goes from discovering who he's supposed to be to what's been happening on the shadow world. No romance; extremely interesting; realistic, but unsatisfying ending.
Aoi Hana
F 220820 Fumi and Akira's love story, from first day of highschool to graduation day. Includes side love stories (all lesbic). Sweet and the development feels natural. Includes incest and improper age-gap relationships, they're not the focus and aren't glorified/romanticised.
Utakata no Uroko
F 060820 RR 071022 An extremely beautiful story.
Wandervogel
Confusing, yet interesting. Everyone's got some sort of mental condition and, while their stories are heavily impacted by that, it's not the main focus. First couple met as kids and then reunited (1, memory loss and 2, was a shut in). Second couple, guy helps the other clear some misunderstanding with a writer who almost strangled him (1, reads minds and 2, claustrophobic).
Vanilla Chocolate Cigarette
F 280820 Two love stories, same universe. First one is already stablished; they have stupid childish fights, but love each other dearly; they help/give advice to Tsubaki when he needs it. Second one follows Tsubaki, moving to the same apartments to first couple, learns how normal gay relationships are, improves his communication skills and starts falling in love with his first friend from his job (Azuma).
Tsuki to Suppin
S 311219 Every day life of Shiho and Akari. Lesbian couple. Super sweet and heartwarming.
Tatoeba Konna Koi no Hanashi