Where is the powerpass gear?

[One Punch Ace]

I don't think I got it.

[76561198834368292]

In order to get the equipment chest, you need to play 100% of the powerpass i.e. all missions that are related to Trixion at Beatrice. You will have to not miss any of the missions, your entire game is somewhere around half an hour of game time.
You will then receive the chest as a reward in your mailbox. That's it.