Doro no Bunzai de Watashi dake no Taisetsu wo Ubaouda Nante

Protect the girl who is destined to die an untimely death. That is the mission given to me and my senpai from the heavenly realm. How is it a job... to come down to earth and protect stupid human beings? Moreover, protecting an ordinary girl...? Why do we, beautiful angels, have to do such a thing! Senpai must have been thinking that way all along. I believed that, but why that kind of--?