Just like Haruka and Aoi, he attend St. Cherine. He is one of the most popular boys in their school due to his looks, and it is seen that even Haruka has a few feelings for him. Yuito can also transform into Misty Knight, and usually comes to help when Twin Angels need help. Yuito Kisaragi is parallel to Sailor Moon's Tuxedo Mask (Mamoru Chiba).
He 'dies' in the tenth episode due to explosion, however, in the last episode (12), he appears again, showing that he actually didn't die from the explosion.