Jinzou Ningen Katei Saaku

Summary

Every night at 7:00 pm comes a time of shadow, and to protect the town the android Cutty Sark fights until the time of shadow passes. But Cutty Sark, who resembles a high school girl (of course) and doesn't speak any understandable language has fallen in love with a boy at the local school, and of course this means that things will never be the same… (Source: Mangaupdates)