This is 'The Witch and the Hundred Knight 2' DLC 'Mana Portal'.
By purchasing it, you will be able to use the 'Mana Portal' which allows you to return to base at any time other than boss battles.

Software subject to license (us.playstation.com/softwarelicense). Online features require an account and are subject to terms of service and applicable privacy policy (playstationnetwork.com/terms-of-service & playstationnetwork.com/privacy-policy). One-time license fee for play on account’s designated primary PS4™ system and other PS4™ systems when signed in with that account.

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The Witch and the Hundred Knight is a trademark of Nippon Ichi Software, Inc. Licensed to and published by NIS America, Inc.