To Me, The One Who Loved You S01

In a world where traveling to parallel worlds has become a daily routine... Kyouma Hidaka, who lives with his father after his parents' divorce, sees a girl named Shiori Satou at a research institute where his father works. They develop a little interest in each other, but when their parents get married, things change. Kyouma and Shiori, who have convinced themselves that they'll never be in a relationship, decide to go to another world where there are no step-siblings... the world wouldn't make sense without them.