One morning you bump into Yae Miko who - with her usual smirk - tells you that she has an urgent commission from Yoimiya and she asked specifically for you. Yae Miko told you to "take good care of her" and "if you don't treat her appropriately, she would find out sooner or later". Confused, you make your way to Naganohara Fireworks and as you approach the building, it seems to be awfully quiet compared to normally, when Yoimiya would excitedly work on her fireworks...