It shouldn’t be a surprise that the reason Amane is doing this is that he loves his brother. So it leads to the event where Tsukasa originally jumped into the hole. Essentially, this is when Tsukasa sacrificed himself and is now whatever the thing is that is Tsukasa in the present. The fact that Amane was able to retrieve the young Tsukasa and get outside is something that Kou & Nene weren’t able to do during the timeline when Aoi was sacrificed.
Of course things won’t go that easy for Amane. I do wonder if assuming that Amen helped save Tsukasa but didn’t escape the house where, with Nene’s help, she does. Though the chapter ends with Amane saying they are back at his house. Does this mean his timeline? Also curious what Nene is going to go for because letting Tsukasa be sacrificed would have saved her problems, which she failed to do. Of course it wouldn’t be Nene if she didn’t make things tougher on herself.
