Reporting child abuse Throwaway account

I work for a large chain eikaiwa. One of my students mentioned casually that her dad hits her and her mom.

What should I do? This child has been known to lie sometimes so I can't take her word as gospel truth, but it's not sitting right with me to do nothing with this information because the way she mentioned it didn't feel false.

I'm in Kansai and don't speak Japanese so calling helplines is impossible (obligatory: I know I should learn some, but I'm on a 1 year WHV plan so I'm realistically not going to get fluent). I'd like to stay anonymous if possible. At this point, I'm not sure if I'm asking for practical or ethical guidance on if I should even act. On one hand, my personal ethics is having a really hard time with the idea of doing nothing, but on the other hand, I feel I shouldn't necessarily force my ethical perspective on Japanese sensibilities. Help please!