Saito is a high school student who was once suddenly called to the parallel world of Chalkeginia. Looking for a way to return to his home world, he lives as a familiar to the beautiful girl-magician Louise. At the Tristein Academy of Magic, which she attends, the summer vacation ended, and Saito and her mistress, who worked part-time in the capital's shopping district, also returned to school. However, preparations are underway to wage a full-scale war with Albion, and it is decided that most of the students will join the ranks of the active army, then Louise, taking Saito with her, returns to the ancestral estate to get permission to join the army. However, she could not get permission, and instead her family, who learned that the girl fell in love with a person with a lower social status, raise the noise... What will happen tomorrow with Louise and Saito, and also with Tristein?! In an unusually popular exciting romantic comedy about a parallel world - an even more new turn of the plot!