Unlike typical stories where people switch bodies temporarily, Yui Ootsuka and Yuuta Kimura find themselves trapped in foreign bodies permanently. When they accidentally fall from a tree, they wake up in unfamiliar vessels with no ability to reverse the switch. Fearful of the consequences, they decide to conceal their predicament and attempt to live their lives as normally as possible. However, the incident deepens their relationship, which was previously limited to just classmates. The pair struggles to adapt to their new identities and grapple with the daily challenges of being someone else over the years. Through this ordeal, Yui and Yuuta realize the importance of comprehending others' perspectives and extending empathy towards them.