My Ribdiculous Reincarnation

An anonymous Japanese salaryman dies and meets a tired goddess in charge of isekai-genre reincarnations, who reveals — for the first time in the genre's history — that the reincarnation pipeline has limited inventory and most of the good bodies are already taken. The narrator's allotment is a single rib on an overpowered harem-lead hero who has already finished his run. The series cycles through reincarnations across the goddess's backlog, each told in a different animation technique — stop-motion, puppet theater, live-action — and committed to the joke that nobody has ever been promised the body they actually wanted.