While struggling to make friends after his parents’ divorce, Koyomi Takasaki meets Kazune Takigawa, but apparently, they already have. Kazune reveals that she’s from World Line 85, an alternate universe in which she and Koyomi are lovers. But in a reality where moving between dimensions is natural, could Koyomi be the one from another world?
my grades were abnormally good, 
even if I never did much studying.
hatte ich, ohne viel zu lernen,
sehr gute Noten in der Schule.
yo obtenía buenas calificaciones
sin estudiar demasiado.
yo sacaba buenas notas
sin estudiar demasiado.
qui m’a transmis la faculté
d’avoir de bonnes notes sans étudier.
ma a scuola avevo ottimi voti,
 nonostante non studiassi poi così tanto.
но оценки я получал поразительные,
хотя толком и не учился.