THERE IT WAS, I was checking the earliest chapters but didn't remember where exactly. Thanks for the info, I've located where exactly: chapter 32, page 15.I've skimmed some of the earliest chapters and it was shown on the day itsuki gets kidnapped by quinn's moonlight sect? It showed sis slumped on the desk viewed from behind her and itsuki noticed the stone in the bottle that used to contain the message itsuki wrote. So either this is fake or it's actually how his sis looks.
She's shown in a flashback on the first page of chapter 44. She looks the same as she does here only with slightly less messy hair.Wait... I'm probably mixing mangas up, but I think his sister already showed up, in a previous chapter where he managed to send a letter to his sister on Earth. And the girl shown it's not her.
Right? Bro raised that flag and immediately had it happen lolBro, you just said you're not letting your guard down. And what happens immediately after?