Oh no, I didn't but I remember what I was doing now. I think I went off to try some side quests since I couldn't figure out for the life of me whereThese 2 bosses are optional, so come back later if you can't beat them.
As for what to do:
Did you beat Xi Wangmu? The boss that woman sacrificed herself to help you beat it.
If you did, the barrier is gone and you can finally go to Ikebukuro bookstore.
Xi Wangmu
Ikebukuro
Holy crap! That explains why I'm getting annihilated, lmao. Thanks.He's level 75. You're not supposed to fight him that early, though I believe it's possible with the right demons.