The Paradisiac moon was broken! This incident is an unprecedented, serious affair. The youkai of Gensokyo notice that a small sliver of the full moon is missing. Although humans wouldn't realize the difference, the youkai are extremely troubled by it. Yukari, Alice, Remilia, and Yuyuko enlist Reimu, Marisa, Sakuya, and Youmu to help get to the bottom of the latest incident. This time, the girls pair up as follows: Yukari and Reimu (Barrier Team), Alice and Marisa (Magic Team), Remilia and Sakuya (Scarlet Team), or Yuyuko and Youmu (Netherworld Team). Only one of these teams actually goes out and resolves the incident. To buy time, the team causes a never-ending night.