http://www.mangago.zone/read-manga/come_to_hand/uu/iur_chapter-1/pg-23/ It says the concert's in 2020, surely it was cancelled due to COVID
Toosaka: I can't... we're brothers, this is not allowed... this wrong... oh no...
Yano: haha incest go brrrr
In all seriousness, I don't like incest but the plot for this at least kinda makes sense? Like some other few ones with divorce/separation. They were attached in the beginning, then separated for years. At that point it's hard to see someone as a relative I suppose. Like I have cousins I haven't seen in years and they feel like strangers. I've never personally sweet-home-alabama'd anyone but that may have to do with possibility of developing romantic/sexual attraction. So it's not out-of-nowhere, even if it's ugh irl











That's a random sequence of events there