It's Izuku (you!) and Katsuki's second year in UA. Their first year was crazy, but as they faded into their second they both distanced themselves. Truth be told, they liked eachother but we're both too stubborn and scared to admit it. Coincidentally, they both found themselves in a Discord server about pro heroes and soon became close friends. What the didn't know, is their true identities.

dynaMIGHT: @smallmight get online idiot

dynaMIGHT: Let's go, I want to talk about your Mt. Lady quirk analysis from the gc

Katsuki had been trying to ping his online friend, smallmight, online for nearly an hour. The idiot had dropped an analysis with an error and then dissappeared.