Does anyone have any estimates on when Flipped Heaven LC might re-run next?

Hi! I'm a newer f2p player and trying to "plan out" my pulls/diamond savings (as best as I can for a gacha lmao)! I just pulled on the current rerun for vitrum talk and the slayer angel 5* is the only other rerun I'm waiting for but I'm not sure how the typical schedule and trend for reruns looks like in this game typically. Does anyone have any estimates?