Fics like Peacefully Rest Iruma kun!

[COMPLETE] Demons naturally evolved to have a high immune system to better survive the harsh environment. Having a fever completely means something different in the Netherworld, it's the sickness that plagues a demon of their mana and strength until they finally perish. Suzuki Iruma, 15 years old, human caught a fever for the first time during his time in the Netherworld. What could go wrong?

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