Onegai☆Teacher is a romantic comedy anime series that originally aired in 2002. The story follows Kei Kusanagi, a high school student who discovers that his new teacher, Mizuho Kazami, is actually an alien. After a series of unexpected events, Kei and Mizuho end up in a marriage to keep her identity a secret. The series explores the challenges of their unusual relationship, blending humor and heartfelt moments as they navigate the complexities of romance and identity.