The Mystery of ChibiChibi! The Big Noisy Chase

ChibiChibi comes home with a bag of candy, and Usagi wonders where she got it. Usagi follows her when she goes out again, believing that she has gone to visit a "world of sweets". She loses track of ChibiChibi, only to find her again in an extravagant mansion with a very rich man, who is turned into a Phage.