An era when countries around the world were engaged in a fierce information war under the surface. Information Bureau vs. East Division Wise Agent of Twilight Loid Forger was on a mission as usual when an operation in progress Strix to change the person in charge. However, the new person in charge was an incompetent man. At that time, at Eden School, the winner was Stella is awarded, the rumored cooking practice will be implemented. Even a little Operation Strix showing the progress of Wise, and in order to protect world peace, Loid proposes to Anya to make a traditional confectionery of the "Frigis region", which is the favorite food of the principal who serves as the judge. The Forger family heads to Frigis on a family trip to try out the authentic flavors. On the other hand, Yor witnesses the whole exchange between Loid and a mysterious woman before leaving, and ends up on a family trip while feeling a little uneasy about the temporary relationship... During such a family trip, Anya discovers a suspicious trunk case on the train. For some reason there is chocolate in it... While wondering about it, the owner of the trunk case returns, and to her surprise, Anya accidentally swallows the chocolate... However, that chocolate hides a serious secret that could shake up world peace!? And as if to fold, a series of happenings that occur on the road!. The fate of the world has once again been entrusted to this temporary family.