Dokkiri Doctor

Dokkiri Doctor (どっきりドクター, Dokkiri Dokutā) is a Japanese manga series by Hosono Fujihiko, serialized from 1981 to 1982 in Shōnen Sunday. It was later adapted into a 27-episode anime television series by Studio Pierrot, originally broadcast on Fuji TV from 1998 to 1999.

Plot
Haruka Nishikikoji is an overweight doctor that never seems to attract any girls. Fate finds a way as he lands a job as a doctor in an elementary school, wherein his workplace can be found on top of the schools' roof and the actual clinic looks like a medieval castle. Just when everything seems to go downhill, a surprise came one day, her first love Koizumi Miyuki, applies as her soon-to-be nurse.