Bag Of Secrets!

Momoka Nishizawa, a shy classmate of Fuyuki's who has an enormous crush on him, and has an alter ego, brings a surprise to school; Tamama, who just so happens to be in Keroro's platoon! But as we venture through this day further on, we begin to learn that there is more to than just the innocent and cute covers of Momoka and her alien partner.
Momoka and Tamama are coming over to the Hinata household! Will Momoka be able to call Fuyuki a friendly 'Fuyuki-kun', instead of a formal 'Hinata-kun'? How will Tamama behave? What will turn out in the end?