Ken Hirai brings an album for the first time in about five years to commemorate the 25th anniversary of his career. Compiles "Boku no Kokoro wo Tsukutteyo" (main theme song of the film "Doraemon the Movie 2017: Great Adventure in the Antarctic Kachi Kochi"), "Kaibutsu-san feat. Aimyon," theme songs for TV series "Non Fiction," "Shiranaindesho?," "half of me," "#302," and more.