Story

ONA by Xiaoming Taiji — 43 episodes, Finished.

Episode 131 to Episode 173.

Synopsis via AniList (English).

Seasons & films

FinishedSpring 2019

26 episodes63 episodes across the franchise, still going

FinishedFall 2011

148 episodes

FinishedSpring 2009

64 episodes

FinishedSummer 2012

25 episodes96 episodes across the franchise, still going

FinishedSpring 2016

25 episodes85 episodes across the franchise, still going

FinishedFall 2017

170 episodes

Picked from our own catalogue — same studio, or the genres overlap.