Slimes are weak to Lailah's fire-based artes so exploit the weakness and create Power Hit chains for Sorey's attacks, which are useless without the exploit. Consider waiting for Lailah to attack with an arte before blowing your SC on the enemy or take command of Lailah yourself and open up on the boss to max the AI's damage with Sorey. Watch out for the boss' Maul attack that it likes to spam when it gets low health, eating Sorey and causing a lot of damage, and keep the combos going to end it quickly.
Follow the path west to a split with two chests to the north containing an Apple Gel x2 and Amber Tiara and then continue southwest. You'll want to ignore the objective marker for a moment and check the dead end to the west for a Soft-Serve Ice Cream and then backtrack for a scene. Fight off the large number of slimes and don't be afraid to back up to avoid being surrounded until the tutorial kicks in that teaches you how to armatize.
Armatization is a huge part of the game and it allows you to combine Sorey's attacks with whatever artes the seraph he armatizes with naturally uses, in this case it will allow Sorey's attacks to be fire-based and allows him to cast her artes.
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