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Properly tag all spoilers 7.
Issei is reincarnated as a devil, and from that day forward, he serves as an underling of Riasu, a high-level devil who is also the prettiest girl on Issei's campus.
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However, someone in the shadows is attempting to meddle with its proceedings.
When he approaches his master, the considerable passions invert among the angels, the unexpected angels, and the demons.