Kawaki has a hard time getting used to school life, but he succeeds in becoming friends with Princess Kae, the object of his guard mission. Meanwhile, Kae wants to get to know her classmates and invites them all to a tea party at her mansion. Since Kawaki has his mission and cannot let Kae out of his sight, he goes along. Despite feeling out of place at the party, Kawaki does his best to fit in, but then he senses something unusual…

Boruto dozes off on Thunder Train and wakes up in an unfamiliar location along with the other passengers. A mysterious individual known as Ouga forces them to participate in a game of death disguised as an experiment—who will successfully beat this game and make it out alive?!