No! I mean, the unstable serum that Yuka gives us. The one that has strong pheromones that make girls crazy about us and where our sweat literally becomes a serum. The one that opens after passing the last day of the month (at this stage of the game) where we can call our girlfriend (in my case it was a Skirt) and invite her to us for a pastel scene and growth. I'm talking about her. You once mentioned that Yuki and Hina (and probably someone else) is she working only on the path of the "Queen's Foundation" or is that not the case?