Kenja no Deshi wo Nanoru Kenja ~ Mira to suteki na shōkan seirei-tachi ~ - MangaDex

This side story retells how Dunbalf/Mira originally contracted all of her summons before the main story began.

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Tensei Kenja no Isekai Life ~Daini no Shokugyou wo Ete, Sekai Saikyou ni Narimashita~ - MangaDex

Kenja no Deshi wo Nanoru Kenja ~ Mira to suteki na shōkan seirei-tachi ~ - MangaDex

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Tensei Kenja no Isekai Life ~Daini no Shokugyou wo Ete, Sekai Saikyou ni Narimashita~ - MangaDex

She Professed Herself The Pupil Of The Wiseman, Isekai Wiki

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Kenja no Deshi wo Nanoru Kenja ~ Mira to suteki na shōkan seirei-tachi ~ - MangaDex

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Uchi no Deshi ga Itsu no Manika Jinrui Saikyou ni Natte-ite, Nan no Sainou Monai Shishou no Ore ga, Sore wo Koeru Uchuu Saikyou ni Go Nintei Sareteiru Kudan ni Tsuite