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Hitori No Shita- The Outcast -

No, but it helps. The show explains most concepts (e.g., Qi, Yin-Yang, Taoist rituals).

Fan consensus: S4 (Chen Du arc) is the peak so far. Hitori no Shita- The Outcast

Crunchyroll (seasons 1–4, partial 5), Funimation (earlier seasons), Bilibili (global). No, but it helps