I Need to Suck Blood Tonight

Minoru Sayo is an office worker who lives an upright but mundane life. That is, until one day, he turns into a vampire.
Unable to forgo his scruples, he refuses to feed on humans and attempts to soothe his thirst with cat blood. On one such night when he's out prowling for a feline friend, he runs into his coworker in the same department, Yama...