Mari and Waka plan on making a cake for their friend, but plans fall apart when Mari opens a mysterious book that sends her flying back in time where she ends up crossing paths with William Gilbert.
Y-You don't know a researcher 
named Eiji Hayase, do you?
No conoce a un investigador
llamado Eiji Hayase, ¿o sí?
Você não conhece um pesquisador
chamado Eiji Hayase?