Adventure Bar Story - (by RideonJapan)

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regarding the last map •••Spoiler:  ??? i found the secret passage
•••Spoiler:  just right before u fight the boss, its the map with chests, right side, most bottom location of chest, there's a secret passage but i cant find the chest in there as it's blind spot.

so anyone know the exact location of the chest in that passage?

oh and after the boss •••Spoiler:  what to do with that yellow portal?
apparently need to •••Spoiler:  trigger something to access it.

someone got the answer already?