Meimi's Sweetheart is a Hedgehog!?

Synopsis

Meimi takes a liking to a hedgehog at a pet shop and thinks about adopting it under the name Ruby. But Ruby has already been bought by a man named Hayase. Cruelly, Hayase makes Ruby swallow a diamond he's stolen and uses the hedgehog as a hiding place. Saint Tail's magic exposes the crime and saves Ruby!