Original title – 魔王学院の不適合者 ～史上最強の魔王の始祖、転生して子孫たちの学校へ通う～
Raw – https://ncode.syosetu.com/n1578dx/
Synopsis – After 2000 years has passed, the ruthless demon lord has just been reincarnated! But his aptitude at an academy for nurturing candidates for demon lords is, “Inept”!?
Having the capability to destroy humans, elementals, and gods, after a long period of countless wars and strife, Arnos the demon lord became sick and tired of all that and longed for a peaceful world, so he decided to reincarnate to the future.
However, what awaited him after his reincarnation is a world too used to peace that his descendants became too weak due to a huge weakening in magical powers.
Arnos enrolled in the Maou Academy established to find any students that might be the demon lord’s reincarnation, but his powers are too extraordinary that those in the academy couldn’t properly judge his powers, so he’s regarded as an “Inept student”. Being underestimated and avoided by most people there, he recruited a girl friendly to him, Misha, as his subordinate and comrade, and strives to climb to the top of the demon race hierarchy to one day reclaim his former title and status. (Taken from NU forum)
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Chapter 1 – Demon King Academy
01. Invitation from Deruzogedo
04. The common sense of the demon king is lacking after 2000 years
06. Forbidden spell – origin magic
14. Magic spell, Demon King Army
16. Extreme difference in magic power
20. Secret magic of the Necrons
22. The treasury of the demon kings castle
28. The guardian deity of time
Chapter 2 – Demon Sword Tournament
Prologue ~Right hand of the demon king~
34. The tempering demon sword saint
35. Grand demon sword training
42. Mother and fathers feelings
44. The unificationist old seven demon emperor
50. Arnos-sama’s support song No.2
60. Final match between those two
61. In the midst of the conclusion
64. The true worth of the demon king
Chapter 3 – Hero Academy
Prologue ~The hero and the human king~
68. The demon king self-studies
70. Mystery of the hero academy
71. Gairadeite expedition test
84. Arnos squad heads to the front
89. Arnos-sama support song No.3 (peerless demon king)
99. Eve of the decisive battle
101. An oath made 2000 years ago
104. The voice of a child echoes across the battlefield
105. Ghost from 2000 years ago
107. May the world be filled with love
Chapter 4 – Great spirit arc
Prologue ~Great spirit mother~
111. Exchange students and a new teacher
115. Mazoku from 2000 years ago
116. Advisor to the fire death king
119. Scarlet monument king’s monument
120. Hard sword and soft sword
125. Ahartherun expedition exam
128. How to make a fairy laugh