Koharu Kawasaki (川崎小春) is a supporting character in The Tunnel to Summer, the Exit of Goodbyes, voiced in Japanese by Arisa Komiya. The series' music includes "The Tunnel to Summer, the Exit of Goodbyes Theme Song FULL「Finale.」- eill | Lyrics", "The Tunnel to Summer, the Exit of Goodbyes Theme Song FULL「Finale.」- eill | Lyrics".