UFO Ultramaiden Valkyrie

"UFO Ultramaiden Valkyrie," also known as "UFO Princess Valkyrie," is an anime about Kazuto Tokino, a young man whose life changes when an alien princess named Valkyrie crashes her spaceship into his family’s bathhouse. The accident almost kills him, but Valkyrie saves his life by sharing half her soul with him. This act turns her into a child, though she can temporarily regain her adult form-along with her special abilities-by kissing Kazuto. The story follows their unusual bond and the complications that arise from their shared fate.