They announced Jump Start battles. Observations:

1. No mention of prereqs to unlock. Does it open separately from the normal event, or does it, as mentioned upthread, require you to fully complete the event fights first?

2. Did someone forget to translate the images on the announcement? Don't recall noticing that happening before. And what's the dungeon called in Japanese? Normally my Katakana can ballpark when it's loanwords from English, but for that first image I'm getting something like "Furusuro-toru Dungeon" though the first word might be Furusuro*shi*toru or Furusuro*tsu*toru. I'll admit, in that block style I have difficulty differentiating between shi, tsu, and the small tsu glottal stop thing that I'm sure has a proper name.

Probably just too used to seeing Katakana used for English loanwords, and trying to map sounds to the wrong language.