What manga has a girl who just woke from a coma with amnesia after taking a love potion from her professor?

It is a oneshot/sidestory and I can't remember the title. It has a girl and she woke up from her coma and apparently forgot everything. A man was basically caring for her during her coma and loves her very much. It turns out he was her biology professor and she is a university student ... he made her grade bad and told her that she has to take a love potion to pass the class so she can graduate. Anywho, they fell in love!