You're most likely to have or participate in an English club as a Prefectural JET at a High School (as seen in the charts below).
Data received in 2017 from a group of 27 JET's working in Oita prefecture as part of information and advice gathered to assist incoming JET's.
English Club Hours And Supervision
In 2017, of 27 JET's who participated in an information and advice gathering for new JET's only 2 out of 15 City JET's participated in an English club - however they were not the main teacher in charge, and their club hours fell within school hours or contracted hours.
Of the 12 Prefectural JET's who participated in the survey - 3 had no English club at their school/s, 3 participated in English club but were not the main teacher in charge and the remaining 6 had an English club and were also the main teacher in charge. However English club hours for Prefectural JET's trend towards being rarely or never within school hours/contracted hours. Although 2 JET's mentioned having either an English lunch club or holding some meetings within lunch hours.
Senpai Advice
Games really help. Sometimes kids just want a friend, not an English partner.
Just play games unless told otherwise. It's awesome and a break from English like they get in school. However! Never miss fun teachable moments, Kids love having English taught to them when they dont know that is what is happening. Also, I take song requests at lunch club and sometimes i tell them what a weird lyric means. It"s awesome.
Ask your kids what they want to learn about or focus on. Google is your friend if you need help finding ideas or materials
It's gonna be mostly girls if not all girls so prepare for girl talk
It's a good chance to play games and get to know students, also good for English conversation