for those that want a manga with a similar plot after finishing ao no flag, i suggest checking out faded first love. it's very wholesome and is similar to this story, except it focuses more on the two boys falling for each other.
http://www.mangago.zone/read-manga/faded_first_love/
there's so many routes / plot twists that this story can have so why opt for the one that's the most cheesy and unsatisfying. it would be amazing to have a story where the seme realizes he's in a toxic relationship and moves on + sees his self-worth. not only is it refreshing, but it's an eye opener for people that are in these awful situations irl. too bad we all know the ending is going to consist of them ending up together for some bullshit reason, smh.
while it's not the sort of plot i talked about above, this manga is definitely the wholesome plot you're looking for. it's so pure, realistic, and does a fantastic job at representing a gay romance.
http://www.mangago.zone/read-manga/faded_first_love/
shit is getting real!
fuck i read it with her voice zuafaghahh