Shikkakumon no Saikyou Kenja

His strength limited by the magical crest with which he was born, Mathias, the world’s most powerful sage, decides reincarnation is necessary to become the strongest of all. Upon his rebirth as a young boy, Mathias is thrilled to discover he’s been born with the optimal crest for magical combat on his first try! Unfortunately, the world he’s been born into has abysmally poor standards when it comes to magic, and everyone thinks he’s still marked for failure! Now it’s up to Mathias to prove everyone wrong…world’s strongest sage-style!(Source: Crunchyroll)

Shikkakumon no Saikyou Kenja: Sekai Saikyou no Kenja ga Sarani

Shikkakumon Light Novel Volume 07, Saikyou Kenja Wiki

Shikkakumon no Saikyou glass folder icon (V1) by Gaigez on DeviantArt

WN][PDF][EPUB] Shikkaku Mon no Saikyou Kenja

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Iris (Shikkaku Mon no Saikyou Kenja) by kunYKA -- Fur Affinity

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Shikkakumon no Saikyou Kenja: Sekai Saikyou no Kenja ga Sarani