In an era when countries around the world are mired in a fierce war of information, it’s mission as usual for Loid Forger, codenamed "Twilight," a talented intelligence agent in the WISE division of Westalian Intelligence. However, he suddenly receives an order to change his assignment, but the new man chosen for Operation Strix is incompetent.

 

Meanwhile, a cooking competition is being held at Eden Academy. Rumors are that the winner will be awarded a Stella Star. To show that Operation Strix is progressing, negotiate with WISE to continue the mission, and ultimately protect world peace, Loid suggests to Anya that she make the "Melemele," a traditional pastry from the Frigis region and a favorite of the principal, who is also the head of the judging panel. For this, the Forgers decide to take a family trip to Frigis to taste the real thing. However, before their departure, Yor witnesses an exchange between Loid and a mysterious woman, creating some uneasiness about their temporary relationship during the trip.

 

During the trip, Anya discovers a key, and through Bond's visions, finds a trunk on the train which contains a single chocolate. As she wonders about the chocolate, the owner of the trunk case returns. Surprised, Anya accidentally swallows the chocolate. However, behind the chocolate lies a serious secret that could threaten world peace!

 

And just like that, a series of happenings occur on the journey! The fate of the world has once again been entrusted to this temporary family.