Quick answer — "Daidaidaidaidaisuki na Kimi e♡" by Kaede Hondo is the opening theme of The 100 Girlfriends Who Really, Really, Really, Really, REALLY Love You.
"Daidaidaidaidaisuki na Kimi e♡" by Kaede Hondo is the opening theme of The 100 Girlfriends Who Really, Really, Really, Really, REALLY Love You.
"Daidaidaidaidaisuki na Kimi e♡" is performed by Kaede Hondo.