I found the following users who may fit your language exchange criteria:

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/klp_eee	2023-12-31	Post	5	Japanese (Native)	English
u/maruchakyo	2024-01-10	Post	5	Japanese	English
u/real-ad6876	2024-02-27	Post	5	Japanese	English
u/keita1130	2024-03-10	Post	5	Japanese	English
u/doctortennant0418	2024-01-27	Post	5	Japanese (Native)	English

Please feel free to comment on the above posts to get in contact with their authors.

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^{Hermes: a bot for r/Language_Exchange | Documentation}

Hello！I am native Japanese and I would like to help your sister. I prefer to use discord. If you are interested in, please dm.