Just out of curiosity... I noticed the end credits a few episodes back. Is all this just post-game stuff, or stuff you went back to an earlier save and did after getting to the final boss?
Actually I haven't beat the game yet. When you hit the credits the first time, you will be tasked to reach the 20th floor in the main dungeon to find out who the cannon final boss is. After completing certain side quests from Hana, there's a couple of items you can obtain that will open up locked areas in the extra dungeons found in the overworld where you'll find stronger enemies, better gear that will help you on your journey to reach the 20th floor.
@Jlorenzana1988 you can get it digitally through the playstation store. You have access to the game if you have the ps plus extra subscription or if you buy the game for $4.99 USD
I feel your pain, she's definitely one of the harder bosses to deal with since she attacks first before everyone else does. I got lucky here because she didn't decide to finish me off fast
