
Maybe count tachibana? https://www.mangago.zone/read-manga/count_tachibana/

Maybe try devilman? The story is kinda about a queer one sided love story of the mc and his best friend but focus on so much more beyond thier "love" story. It talks about the end of the world and how humanity act under the pressure of knowing it's going to end and really has beautiful takes about what make us humans and the ties that biunds us also contains christian symbolism. (The manga is old so the art style may bother you a little, netflix did a reboot while ago but beware that while the story is still enjoyable, they changed alot of things and alot of events/characters..etc but still loyal to the main concept.)
(Also the end may be confusing (fun fact it is what inspired Evangelion ending) but if you read the sequel "Amoun" it will helps you to understand what happens, also I love devilman so much so i you read it, i can explain the ending to you if u want to)

Other stories i can think of that have queer charcters and queer love story as a side plot is, yuri on ice, bana fish and no6. They all have a plot that focus on something while maintaining a queer love story that isnt the main focus and for the The last two, it is more of implicit then it's explicite.
Ao no flag is also a good recommendation, while it is alove story it doesn't like entirely focus on the queer side rather it focus on the coming age aspect of high school love and the struggle of teenage years.
Mangas under any genre that have queer themes? Romance is optional but the main focus should be on something else. Basically just a story that happens to have gay main characters and not a story about main characters being gay if that makes sense.
Basically I'm asking this question in a different font https://www.mangago.zone/home/mangatopic/19002268/