After a battle with the Acceleration Research Society, Kuroyukihime and her Nega Nebulus Legion finally decide to destroy the Oscillatory Universe White Legion once and for all. But in order to challenge the White Cosmos, it is absolutely necessary for them to conclude a truce with the Green Legion "Great Wall". Haruyuki goes to the very heart of the Green Territory - Shibuya - to negotiate with the Green King Green Grande. But, despite the seriousness of the situation, there he meets... a swimsuit-clad Kuroyukihime in the pool of an expensive hotel?! What is this, a new workout? Or did she just want to relax?!