Fics like The Oni's Tuner

When humanity only has the unstable power of relics to turn to in the face of anihalation, the grim reality of relic fusion is forced upon Mitsurugi Meiya. Such an unstable state of being puts a great strain on the swordswomans body, thankfully, she has a relic compatible partner capable of taking the strain off of her. However, tuning a relic fusion is easier said thand one...

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