Helck

A long-running fantasy series from Shogakukan, Helck (2014–present) follows a powerful human hero who, after the Demon Lord's defeat, unexpectedly becomes a candidate to become the new demon ruler. The core of the story is a tournament arc among the demon realm's elite, where Helck's mysterious past and true motives slowly unravel. Writer and artist Nanaki Nanao built the series around a deceptively simple premise, blending action, comedy, and a deepening mystery that has kept readers engaged across its decade-long run.