Logan ends up in a world of familiars, where everyone can make a contract with a familiar to get super power and grow stronger. The first familiar Logan summons is a legendary angel, and it draws a lot of shock and envy. But fate messes with him, because right when Logan is about to make a contract with the angel, the angel looks down on his plain background. "Someone as noble as me—how can I be driven by a low-born bloodline?" After that, she goes over to the noble-born school beauty, leaving the whole crowd full of sneers. Right then, Logan awakens a system, and he can see all a familiar's hidden info and evolve their bloodlines, talents, and skills without limit. "Since it won't listen, I'll switch it out, the next one will be more obedient!" With everyone laughing at him, he just made a contract with a low-level succubus. "A low-level succubus? Once this kind of familiar gets off the bed, its fighting power isn't even as good as a hyena!" "A loser with a succubus—this kid will never have to worry about women anymore, haha!" ... Many years later. When demon fire lights up the stars and blood-red wings cover the sky, people finally realize—standing behind Logan are all those ancient, scary beings from myths and legends.
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