JAL Website now says that the MEL-NRT flight is cancelled but that they're considering setting up extra flights based on demand trends: https://www.jal.co.jp/jp/en/info/2022/inter/220501_05/I too had my JAL MEL - NRT flight just cancelled in May..
I’m hopeful it will come back as JL8774 like the March flights.
Background - JAL Cancelled JL774 MEL to NRT and replaced it with JL8774 departing MEL 2 hours earlier. That would still work perfectly fine for me, if there are seats available obviously.
Either that or beg Qantas to SYD - HND and hope for JAL HND to HEL