I'm putting this in Bromance list cuz the romance is very very very subtle. There's no open confession. I think the only thing close to confession from MC is on his deathbed while from the ML in the extra page
Friends? Well, to be honest, their relationship kind of toxic
Siblings
Their voice is so good
CV
https://m.youtube.com/watch?v=BxxXu_d-OGM
Talking based on drama: Their relationship... I can't
I love them
Sano & Mame
Fuji & Ogoso
Haruaki & Sano
Haruaki & (Oni -sensei)
Principal & Abe
Friends
Partners in crime
Hero and Archiver
They're more like parent and kids actually due to MC's real age even the members agree he acts fatherly
This kinda have some kind of homoerotic undertone
Cure Blood