NINKŪ

1. 01

   Fusuke the Ne-nin!

2. 02

   The Appearance of the Tori-nin Captain

3. 03

   Touji of the Land

4. 04

   The Attackers

5. 05

   The Smoke of Concealment!

6. 06

   The Terrifying Base

7. 07

   Ice of Onjun!

8. 08

   The Sealed Heart

9. 09

   Mother's Lullaby

10. 10

    Sad Parting

11. 11

    The Trial

12. 12

    The Method to Become Strong

13. 13

    A Faraway Promise

14. 14

    Overcome the Pain

15. 15

    True Courage

16. 16

    The Legendary Forest

17. 17

    Ninku Trap!

18. 18

    Desperation!!

19. 19

    Till the Ends of the Battle

20. 20

    Dolphin and Youth

21. 21

    The Hole of Hell

22. 22

    Terror of the Fist

23. 23

    Flame of Sekirai!

24. 24

    Rebellion for Freedom

25. 25

    Father and Son!

26. 26

    Farewell, Hiroyuki

27. 27

    The Valley and Fuusui

28. 28

    The Three Demonic Warriors

29. 29

    The Sky Dragon Appears!

30. 30

    The Shapeless Sniper

31. 31

    Breakthrough the Barrier

32. 32

    The Awakened Sekirai!!

33. 33

    Prologue to Crisis

34. 34

    The Magic that Summons Death

35. 35

    Heroes of the Sky!

36. 36

    The Mysterious Youth

37. 37

    A Departing Promise

38. 38

    Fuusui's Cape

39. 39

    The Crushed Ice!? The Sky Dragon Reappears

40. 40

    Confrontation! The Use of Fog VS The Use of Wind

41. 41

    Rihoko's Tears, Father's Hometown

42. 42

    The Fist of Wrath! The Man who Slashes Ninku

43. 43

    The Horror Building! The Mysterious Haunted House

44. 44

    A Confrontation!? Friendship that Uses Secret Weapons

45. 45

    Miss Ninku! Operation Breakthrough!

46. 46

    Assassin of the Night! The Sealed Technique

47. 47

    To the Capital! The Rebels of Justice

48. 48

    The Revived Memories! The Man who Captured Mother

55 episodes in all — the full list is in the app.

1. OP1

   Kagayaki wa Kimi no Naka ni

2. ED1

   Soredemo Ashita wa Yatte Kuru

   EP 1-28
3. ED2

   Sora no Namae

   EP 29-50
4. ED3

   Sorezore no Ashita e

   EP 51-55