Sensei no Susume

With God dead, the angels decide to seek a successor, and the reluctant angel Rain is selected as one of four candidates. Rain and the other candidates must descend to Earth for a year and undergo a test to prove their suitability for the role. Each candidate may reveal their true identity to one human. Rain chooses Natsume Shirou, an ordinary high school student who dreams of becoming a teacher, as his helper. For their test, Rain and Shirou must raise a baby with no thoughts or emotions of its own into a creature as close to a human as possible.