Nishimachi International School is trying to reach alumni from the 1980s after a teacher from that period was convicted of child sex abuse in England.
Richard Biddick, who taught fifth grade at the school from 1982 to 1988, admitted abusing an 11-year-old boy in Britain shortly before moving to Japan, U.K. newspapers reported last month. The victim is now an adult, and Biddick, also a former scoutmaster, is retired.
The court heard Biddick befriended the boy while train-spotting and served him drugged hot chocolate before abusing him as he slept. In 2002, he was convicted separately of possessing thousands of obscene images of children.