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?
Inside Koyomi Takasaki, 
the husband now sleeping at your side,
In Ihren Mann, Takasaki Koyomi,
der neben ihnen schläft,
Tu marido, Koyomi Takasaki,
que duerme ahora a tu lado,
Tu marido, Koyomi Takasaki,
que duerme ahora a tu lado,
Et maintenant,
nella persona che dorme al tuo fianco,
Seu marido, Takasaki Koyomi,
que está dormindo ao seu lado agora,
И сейчас…