The true culprit is Meganezaru

One day when it was completely spring, Ai-chan went to visit Papi's grave. Spank and Barron are also together. When I was offering Papi's favorite cheesecake in front of the tombstone, Michael and Seri came. It is said that Chico, a glasses monkey that Michael keeps, is missing. Suddenly, the cake is gone. The criminal is that Chico, but Spank is dressed in a wet coat. Seiya, who was told the reason from Spank, tries to prove Spank's innocence...