To Me, the One Who Loved You

Koyomi Hidaka and Shiori Sato's romance blossoms at his father's research facility, only to be complicated by their parents' unexpected love, leading to a marriage that threatens to make them stepsiblings. Desperate to escape this fate, they embark on a quest to a parallel universe. While dimension-hopping is a known phenomenon in their world, it brings unforeseen consequences. As they search for a reality where they can be together, the couple must confront the potential sacrifices required to turn their dream into a tangible existence.