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?
and as a result, our relationship 
was often on-again off-again.
und am Ende haben wir uns
oft gut und oft schlecht verstanden.
Como resultado,
nos acercábamos y alejábamos.
Como resultado,
nos acercábamos y alejábamos.
On se rapprochait pour s’éloigner
continuellement.
Alla fine, io e Kazune non facevamo altro
 che metterci insieme e mollarci.
Como resultado, a Kazune e eu
ficávamos entre separações e voltas.
Поэтому мы с ней…
то сходились, то вновь расставались.