Aa! Megami-sama!: First End

Keiichi Morisato is an ordinary college student with little success in academics or relationships. After dialing an incorrect number, he unexpectedly summons Belldandy, a Norse goddess. Initially skeptical, Keiichi eventually asks her to remain with him permanently. Belldandy agrees to stay on Earth, bound to him for life. Their coexistence marks a dramatic shift for both, as she adapts to human life and he faces the unforeseen consequences of his wish.