Last Post: 3:47:07pm, 05/06/2021
Another season of Shakugan no Shana that covers the prequel story and the LN volumes season 2 skipped over would be nice, or maybe a remake of season 2 that covers the corresponding LN content properly instead of being largely anime-original. If anything, just a movie that covers the prequel content would be fine too.
Either that or another season of Log Horizon, when the author releases enough LN volumes (or WN content) to make one. If he sticks to the original plan of ending the series at about volume 15, then another 2-cour anime season should be enough to cover the whole story, too.