There is a new area available.
Talking to Telesa at Rokoko and selecting the option 'I want to go to another world." Will allow you to visit the area.
Area is called "Pocket Library" - NPC is called "Jon".
Selecting 'I wanna go to the Tower of Delusion' brings up the option to go to the Flame Tower.
Inside the Flame Tower you will fight floor by floor small challenges.
When I completed it, it was a 10 floor challenge that rewarded 31 Flame Tower Shards (FTS) which are a non-inventory currency that allows you to purchase items from Jon.
Options are:
Flame of Calling (xtal) - 1000 FTS
Flame of Calling (AI Crysta) - 1000 FTS
Forbidden Fruit - 20 FTS
Otherworld Tonic - 20 FTS
Rare Supplement - 20 FTS
Unknown Corrosive Ore - 100 FTS
Hero Swordsman Sheath - 1000 FTS
Hero Archer Quiver - 1000 FTS
Hero Mage Catalyst - 1000 FTS
Hero Clawer Bandages - 1000 FTS
Hero Thrower Gloves - 1000 FTS
I don't know what any of these items do, this is a daily event. So as far as I can tell you are only able to get 31 FTS per day. If anybody has information from the JP version of Iruna I would love to hear about it. I'm posting in hopes that someone has information because I'm really curious.
Sorry for formatting, posting from mobile.