The House in the Cerulean Sea: TikTok made me buy it!

Then one day, Linus is summoned by Extremely Upper Management and given a highly classified assignment. He must travel to an orphanage where six dangerous children reside, including the Antichrist. There, Linus must somehow determine if they could bring on the end of days. But their guardian, charming and enigmatic Arthur Parnassus, will do anything to protect his wards. As Arthur and Linus grow ever closer, Linus must choose between duty and his dreams.