tbh, idk if this fits 'realism' but it also kinda does(?): https://www.mangago.zone/read-manga/annarasumanara/
https://www.mangago.zone/read-manga/blue_period/
and this one: https://www.webtoons.com/en/drama/about-death/list?title_no=82 (i'm linking webtoon bc it has music for each scenario and it makes you feel thingsnsnsn)
okay these three definitely don't fit into "realism" and more magical realism/the fantastical, but when you first said 'nostalgic' i really thought of these, so if you're interested:
- https://www.mangago.zone/read-manga/fukigen_na_mononokean/
- https://www.mangago.zone/read-manga/the_planet_walks_alone/ (i haven't finished this one tho but the vibes i got in the beginning were just nostalgia)
- https://www.mangago.zone/read-manga/saihate_no_paladin/
Sth that can't be defined just by labelling it happy/sad or good/bad feelings? Yet at the same time, it touches on sth emotionally relatable to us - that's how I define "nostalgic" ^^ if same for you then maybe try these:
* She and her cat (it touches on feeling alienated in a life that seems "not too rough" as people like to define, a girl's life story told in the perspective of her cat pet who loves her): https://www.mangago.zone/read-manga/kanojo_to_kanojo_no_neko/
* A story concerning sweet (shoujo ai, it has supernatural elements but I think the story has a good balance between dreamy cute and realistic emotion, it touches on the fragility of life): https://www.mangago.zone/read-manga/a_story_concerning_sweets/
* Tsuki no Uragawa (shoujo-ai, short oneshot, sad but it hits on how we tend to ignore what we have until it's over): https://www.mangago.zone/read-manga/tsuki_no_uragawa/
A manga that’ll make you feel nostalgic (does that make sense?) something realistic ig