"feelings yakuza" is an internet slang term referring to "those who turn their personal discomfort into a social evil and try to erase the target completely". It has been used in proship/antiship discourse.
Typically, Americans will harass Japanese artists for being proship or pedophiles for what they draw. It's a concept that may be difficult to understand in Japan, where all fictional depictions are allowed, it's not good to insult someone's work, and people are looked down upon for not being able to distinguish between fiction and reality.
when your inner feelings for someone are so dangerous and may cause chaos that you keep it hidden and hurt yourself (please dont keep your feelings hidden no matter how bad they are)
Late NightFeelings are those melancholic feelings that you get when you're alone at home as night grows later and later. Caused by beeing sleepy, they disappear the next morning and make you feel like a retard.