To be honest, this feels like it is trying to copy some of the success of Oregairu by introducing a pessimistic, self-deprecating MC while at the same time getting a bit of steam from time-traveling shenanigans. Like everyone else points out, it started strong but it surely getting closer to...
Its kind of funny how the plot of the story (the female protagonist struggling with coming to terms with her untimely death and everything that happened in her absence) is so similar to the Author's own struggle with the story (it seems like there is no reconciling between the first chapters and...
It would be one hell of plot twist if miss thief had actually stolen those chocolates from someone else and not being discovered, you know, like an actual good thief does.
To be honest, if the human does as much as smile to the angel senpai, she will surely get an "untimely death" from the other angel. And it will not be a painless one.
Still better than keeping the chocolate for years in a shrine dedicated to the girl as a sacred object along with her hair and some other stolen goods, the way a yandere simp would. (still better, but not by much)
Legend has it tag was stolen from this series. Also tags warning of "older woman aiming to younger boy" seemed to have been stolen as well. Only clue is a possible "Ara Ara" sound heard at the crime scene.