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Struggling magician Alto accidentally summons powerful, mischievous demon Vermeil from sealed book, forming magical partnership.

Retired scientist Omori and alien patrolman Jaco team up to defend Earth from a looming galactic threat.

Shuuichi discovers spiral galaxy; jealous astronomer Torino covets fame, as Kurouzu-cho faces more spiral horrors.

Legless girl Yomi guides readers through lurking horrors hidden in everyday life.

High school girl juggles maid-cafe debt, detective dreams, and supernatural mishaps in her quirky town.

Spin-off romance of Onoda and Deguchi from Doushitemo Furetakunai, exploring love from awkward supervisor-subordinate start.

Princess held by Demon Lord faces execution through relentless torture.

Girl time-slips to ancient Japan, captured by clan to be sacrificed as dragon god's bride.

Sickly Deon Hart is secretly feared Demon Arut, misunderstood as powerful.

Princess Sakura, sole Adaar survivor, flees to temple and summons a "rare human" after Dhala Empire's invasion.

A novel centered on Dio.

Catholic schoolgirl Miu accidentally summons Satan while casting a love spell, who demands her virginity as payment.

Yosuke's family must protect a mermaid's egg every 60 years, but modernization threatens their ancient promise.

Poor boy's debt paid by mysterious girl, but she imposes an undisclosed condition in return.

Kosuke is abducted by dominatrixes determined to steal his virginity, threatening his childhood promise.

Weak orphan Theo summons devil Helvi, proposes marriage; she accepts, and their overpowered love conquers all obstacles.

Shy boy accepts gyaru's dare confession, but her genuine feelings spark their awkward first love journey.

God's error kills student; 500-year sage training makes him world's simplest, strongest swordsman.

Momoka sits next to rumored scary boy Narumi; discovers he may be misunderstood, sparking potential pure love.

Teen detective Kei, who talks to cars, solves mysteries across Iceland's wild landscapes while confronting supernatural legends.