Seirei Gensouki: Spirit Chronicles (Seasons 1–2)

Seirei Gensouki: Spirit Chronicles (精霊幻想記, 2021) — watch online this Japanese isekai anime adapted from Yosikage Kiseki's light novel series, directed by Sota Shiro for TMS Entertainment. Tokyo student Haruto Amakawa dies in an accident, never finding the childhood friend he'd spent years searching for. His consciousness wakes up inside Rio, a slum kid in a world of swords and sorcery, and both sets of memories start running at the same time.

After Rio rescues a kidnapped princess, the king enrolls him in the royal academy — a school built for noble children, where he has no family name, no allies, and no explanation for why he sometimes thinks in a dead boy's voice. The dual-identity tension drives the story more than the magic system does, which sets it apart from the average power-fantasy entry in the genre.

The cast includes Yoshitsugu Matsuoka and Tomori Kusunoki among the leads. The first season runs 12 episodes. If isekai usually leaves you cold but you're curious what the subgenre looks like when it slows down to ask identity questions, this one earns its runtime. Stream Seirei Gensouki: Spirit Chronicles (2021) online on iFILM.