From AOC Translations:

A fantasy love story about a demon princess who falls in love with a human boy!

In order to fulfil their contract from long ago, Giselle descends into the human realm to find her partner, a human boy, Shiina Ichiritsu. In order to get even a little bit closer to her love, Giselle transfer into the school Ichiritsu attends, an all boy’s boarding academy! However, Ichiritsu is no longer the boy she knew 6 years ago...

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This is a fantasy love story about a demon princess who falls in love with a human boy. They exchanged a pact when he was young, and Giselle descends to the human world once again to convey her feelings. The target of her affections is a human boy, Shiina Ichiritsu. In order to get closer to him, she enrolls into his all boys' boarding school! But he's not how he was before at all!!!