The first chapter was very "all over the place" the sceond simply made no sense, no resolution, no explanation, seems liek MC never recovered from his loss of will in the first part, didn't get together with senpai, didn't go to Africa, somehow the sister returned as a golem with some more years on her and we get to know they are similar and she simply stopped doing the "pile up stones" rite in purgatory.
Then hinted at marrying her brother, not sure in what of the 2 worlds, and the whole thing stopped for good.