Glistening waves and endless blue skies! Descending upon the Gensokyo of Eternal Summer is none other than... That's right! The ultimate vampire sisters, Remilia and Flandre Scarlet! A lady enjoys playing in the sea to her heart's content, and a true lady is never afraid. Behold the heroic story of the Scarlet Sisters, rulers of the beach! What's that? Are they really OK in the sunlight? Hm... Let's wait while they apply Patchouli's special sunscreen.

"Special sunscreen, applied! Beachball, inflated! Bottle rocket, assembled! Everything's ready! A vampire that can walk out in the midsummer sun is pretty much invincible, wouldn't you say? Right then, let's go to the beach! Hm? What are we going to do first? We'll get the bottle rocket ready for launch, of course! First, we fill it with water... Hm? Do you smell that? ...Oh, no! M-My wings are burning! Retreat to the shade! We need sunscreen, stat!" (Please wait while the emergency is resolved.)

"This time we're ready for sure! There's no need to fear the sunlight*!" *Note: Avoid splashes of water so sunscreen doesn't wash off. "The bottle rocket is ready for launch! Now we have to step on the pump to fill it with air... I'm going to make it soar all the way to the moon―ARGHH!" Remilia had let her guard down and failed to notice the beach ball flying straight at her. With no warning, it struck her in the back of her head, and she collapsed into the sand. Laughing gleefully at the sight of Remilia's limp body was none other than her little sister, Flandre Scarlet.

Water splashed up into the skies of the midsummer beach as the Scarlet Sister's battle, "Bottle Rocket VS Beach Ball," raged. Even between sisters, surprise attacks are strictly forbidden! No amount of getting wet or tumbling into the sea would end this battle. (Although, someone should put a stop to it soon.) Water streamed out from the base of the bottle like flames from a rocket engine. Great waves crashed about them as if they had invoked the ire of Cetus! The sisters' battle was getting more and more intense! "I'm glad they're having fun." "Won't their sunscreen wash off...?" "I wonder if we brought enough for them to reapply it... Hrmm..." So went the murmurs of the servants as they watched on nervously! At that moment, a small devil came running toward them. "Something smells good! Are we having grilled fish for lunch?" ...Remilia's wings were burning again!

The sisters had their sunscreen reapplied and relaxed with some barley tea and shaved ice. Soon, everyone was playing with the beach ball together. And before long, it was night. Time really flies when you're having fun... Wait. That wasn't a heroic story at all! ...Oh, well. At least it was fun! But before they could go home, they still needed to launch the bottle rocket. Up and up it flew into the night sky, quickly disappearing from sight. Perhaps it actually made it to the moon. What fun awaits the Scarlet Sisters tomorrow? There's no end in sight for these eternal summer days...