Please Teacher!

Onegai Teacher is about a boy, Kei, who suffers from a very rare disease that puts him in a "standstill." One standstill put him in a coma for 3 years. He meets an alien, Mizuho, who is researching earth,. Upon discovering her idenity, they have to live together, and they fall in love. Kei is forced to hide their relationship and love triangles perspire. A very good anime which will make you laugh and cry.