Tsuyokute New Saga

After a brutal war, magic swordsman Kyle defeats the Demon King but is left dying. A crimson crystal sends him four years into the past to his once-destroyed hometown where he finds his lost loved ones alive. Armed with future knowledge, Kyle vows to prevent the coming tragedy and rewrite fate.
(Source: Crunchyroll)
Note: Initially scheduled for July 2023, the anime saw several delays and a complete change in Director (previously Norikazu Ishigooka) and Studio (previously Yokohama Anime Lab x Makaria)