King's Proposal, Vol. 5 (light novel)

When Mushiki Kuga misses Void Gardens magicians aptitude exam while subduing annihilation factors as Saika, he receives a notice that he will be held back. To make sure he can move on to the next year, he is made to take a week of supplementary lessons at Nirai Island under Erulkas guidance. But there, Mushiki soon discovers that he will have more than just his grades to worry about...because everyone else whos come to the island is trying to seduce him! Its time to avoid expulsion and protect his chastity!