shonen/seinen romance but it's actually good
Manga
there's a ton of shonen/seinen mangas which main topic is romance but somehow not all of them are... good
Skip to Loafer
Skip and Loafer

Manga, ? vol, 2018
Me:-
Author:9
This one is very popular and no one will fight this
Busu ni Hanataba wo.
April Showers Bring May Flowers

Manga, 12 vol, 2016
Me:-
Author:10
A lovely story about teenagers in love, where it's shown how appearance is not really important
Kaoru Hana wa Rin to Saku
The Fragrant Flower Blooms with Dignity

Manga, ? vol, 2021
Me:-
Author:9
Besides the main couple, all the other characters are very compelling and everything feels alive
Yano-kun no Futsuu no Hibi
Mr. Yano's Ordinary Days

Manga, ? vol, 2021
Me:-
Author:9
another great story about teenagers understanding what love is, with a side of comedy and lovely characters
Ao no Flag
Blue Flag

Manga, 8 vol, 2017
Me:-
Author:10
The only way i would like a love triangule to work out
Ase to Sekken
Sweat and Soap

Manga, 11 vol, 2018
Me:-
Author:8
i felt like i was about to get diabetes, they were just that sweet
Kamibukuro-kun wa Koishiteru
Mr. Paper Bag Is in Love

Manga, 2 vol, 2020
Me:-
Author:9
super lovely and funny story
Kimi wa Houkago Insomnia
Insomniacs After School

Manga, 14 vol, 2019
Me:-
Author:8
it won't disappoint
Shigatsu wa Kimi no Uso
Your Lie in April

Manga, 11 vol, 2011
Me:-
Author:10
a classic by now, its just... a lot
Yugami-kun ni wa Tomodachi ga Inai
He does not have any friends.

Manga, 16 vol, 2012
Me:-
Author:10
this is not properly a romance, but in my opinion, the ending of this manga is super romantic if you just know how to read between lines
Koe no Katachi
A Silent Voice

Manga, 7 vol, 2013
Me:-
Author:10
I would say this isn't romance either but honestly the way their story develops it's endearing

Manga, ? vol, 2012
Me:-
Author:10
Basically a spokon but it's about music, and the couples are so cute and have an amazing development
Gekkan Shoujo Nozaki-kun
Monthly Girls' Nozaki-kun

Manga, ? vol, 2011
Me:-
Author:8
This one is pure comedy, however the couples are soooo cute, i hope you don't mind a very VERYYYYY slowburn tho
Yagate Kimi ni Naru
Bloom into You

Manga, 8 vol, 2015
Me:-
Author:8
This one is girls love, but the story is pretty cute and romantic
Raise wa Tanin ga Ii
Yakuza Fiancé: Raise wa Tanin ga Ii

Manga, ? vol, 2017
Me:-
Author:9
A very good (toxic) romance, not everything is fluff here but sure is a good read
Kusuriya no Hitorigoto
The Apothecary Diaries

Manga, ? vol, 2017
Me:-
Author:7
Tbh i don't consider this one as a romance but the slowburn is really really good

Manga, ? vol, 2022
Me:-
Author:9
I wasn't expecting to add a HAREM into this stack but i have to accept it, the female characters are really good written, they are not in the story as accessories for the MC even tho the whole premise is him looking for a bride