Nishimachi Shinryoujo no Himitsu - The Secret of Fuyuki

Nishimachi Shinryoujo no Himitsu - The Secret of Fuyuki summary:

About a junior high school English teacher, Craig, who falls in love at first sight with a beautiful, young doctor from the local clinic. Inexperienced and short of help, the doctor, Fuyuki, recruits Craig to help him at the clinic. The two grow close quickly, but soon Craig notices some mysterious patients that visit the clinic and leave a drained and exhausted Fuyuki. -- Note: In the kanzenban (completed) version, ch.1 to ch.3 (old version) is now ch.1 to ch.4. One new chapter was also included.