tbh as someone whos read the novel and indulged almost every piece of content this media has, its not toxic. theyre so perfectly suited for eachother bcz of the same traits that would make any other relationship impossible and thats what kinda makes this special. they both benefit equally from the relationship, hira wants someone special and someone to ‘worship’ while kiyoi desperately wants that and craves that validation. it does become a bit of a problem in the second book when hira worships him tooooo much but they both work to better themselves and change what’s hurting the other. ending point, they def are both a little fked in the head but ig its a situation where “my crazy matches your crazy” fits perfectly (●'◡'●)ノ (sorry for the rambling)
heres the link, the whole first novels been translated https://chrysanthemumgarden.com/novel-tl/mbm/mbm-1-1/
Sorry for saying something late but I just watched the live action and I can now understand you! At first I didn't agree with you for calling this not toxic but then I realized you were right. I just didn't know Kiyoi also liked Hira, it's just the manga that hasn't caught up to that part yet. They are perfect for each other. A king who wants to be loved and a person who loves him more than the whole world.
My sister said she watched the live action. She said it was good but toxic, I'd say they're both psychotic. Uke being creepy, seme being okay with that and even letting him do what he wants. I'll stay to see the ending, probably different from the live action... Probably...