Hyakuman Kai Ieba Yokatta (2023)

Other name: 100万回 言えばよかった / 100 Man Kai Ieba Yokatta / I Should Have Said 1 Million Times

Synopsis: “Soma Yui and Torino Naoki, childhood friends, reunite as adults. Naoki plans to propose to Yui, but abruptly disappears after becoming involved in a puzzling event. Unaware of his death, Naoki roams the world as a spirit. He enlists the help of Uozumi Yuzuru, a detective who can see him, to convey his feelings to Yui. However, Naoki is unable to properly bid farewell to the person he loves, resulting in a heartbreaking breakup without expressing his gratitude, farewell, or love.”