Bokusatsu Tenshi Dokuro-chan

The story is about Kusakabe Sakura, a second-year junior high student who, in the future, discovers the power of immortality. An angel named Dokuro is sent to kill him before he does so. However, Dokuro thinks Sakura can be spared from this sad fate, thus, she keeps him. Another angel named Sabato is later sent to finish Dokuro's dirty job. Pipiru piru piru pipiru pi!