Pour les annonces, tu te trompes ou c'est des annonces mensongères.
http://www.mofa.go.jp/j_info/visit/w...ogramme.html#2Working Holiday visa holders can engage in any kind of job as long as their stay is deemed to be primarily a holiday in Japan. They may not, however, work in places where business is being regulated by the Law on Control and Improvement of Amusement and Entertainment Business, such as nightclubs and dance halls.
En gros, les boulots de soirées te son théoriquement interdit.
Pour savoir si tu as le droit ou pas de travailler dans tel établissement, te reste plus qu'a lire la loi : Law on Control and Improvement of Amusement and Entertainment Business
Extrait
...1. A business which runs coffee shops, bars, or other facilities, and serves its
customers food and drink, and the lighting in these facilities is not brighter than
ten lux (excluding the businesses defined in Items 1 through 3).
2. A business which runs coffee shops, bars, or other facilities, and serves its
customers food and drink, and the inside of these facilities cannot be easily
seen from outside and is not more than five square meters in size...