Fics like Devil Summoner: Sunny Kuzunoha vs. the Army of Nightmares

To find a friend, Sunny Kuzunoha summons a demon. Things go awry, with the Doppelganger attempting to kill his sister Mari to "protect" him. Isolating himself, Sunny takes on the mantle of a Devil Summoner, using pieces from his family history to uphold his family name. As he returns to the outside world, his power tempered by his practice in hermitage, he and the demonic companion he bound to his own body realize there is something sinister hanging over their town.

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