Onegai ☆ Teacher is a romantic comedy and science fiction anime series that follows the story of Kei Kusanagi, a high school student who discovers that his new teacher, Mizuho Kazami, is actually an alien. As they navigate a complicated relationship filled with secrets and challenges, the series explores themes of love, identity, and the complexities of human-alien interactions. The show is known for its engaging plot, charming characters, and a blend of humor and emotional depth.