Start: Bossing team Left, Clearing team Right.
Turn 1: Move your Bossing team one spot down then swap places with your Clearing team and attack the enemy to your diagonal right, next to (2).
Turn 2: Move your Clearing team to (2), then move your Bossing team up.
Turn 3: Grab the giftbox with your Clearing team and attack the enemy above you with your Bossing team
Turn 4: Attack the boss with your Bossing team for a 4-turn clear. If your Clearing team gets wiped by the mystic enemy then, that won't affect your 3-star rating so don't worry about withdrawing when attacked by it.