Responses
http://www.mangago.zone/read-manga/akai_ito_no_shikkou_yuuyo/nmt/tr_chapter-5.5/pg-8/
says on the first panel on the right there that it's stalkers and domestic violence.
That can't be the end yet ! because the guy who gave him the scissors to cut the "red string " said he also cuts Green strings , what are the green strings connected to ? don't leave us hanging , upload more chapters please ! Thanks for sharing this manga it's different and fun to read !