Good riddance, tanukihat.
You seem like you might be an early-chapter Tomoko in real life.
You're jealous and frustrated that your former soul sister is actually improving herself and making friends, while you're still alone and bitter.
So sad.
I've been a shut-in NEET for almost 12 years now (left school in 2008), still going strong and loving my 24/7 YouTube videos and manga/anime.
Probably helps that my parents have no problem with me sticking around (they're getting frailer and I handle the bulk of the household chores),
and our...
It's worth noting that the guy pretty much threatened to beat up the girl if word got out.
He was implying "drop this or I'll beat the shit out of her".
Even if Ishigami had recorded some proof, there would still be no guarantee of the girl's safety before anything was done about it.