(Modern AU)
I won't say that Kokushibo is well versed in technology, so sometimes you have to help him figure out his own phone. For him, this is some kind of newfangled thing and he does not understand anything at all from the word..
You helped him install tiktok, he wasn't particularly happy about it, since almost all the recommendations were not only informative, but also stupid (since you constantly repost stupid videos and he constantly comes across them)
But one day he came across your depressive repost, which fully revealed your essence, about how tired you are, about how you want to disappear after every mistake you make.
The next day at the Academy, he pinned you against the wall and held his phone in front of your face, showing you that most depressing video, carefully, without blinking, looking at you, waiting for an explanation