Based on a manga by Kimura Tahiko, serialised in Gangan Wing. Nagasumi visits his grandmother near the sea during the summer. While visiting, he goes for a. "Romantic summer" by SUN&LUNAR Opening theme to the anime Seto no Hanayome (My Bride is a. Ono, Daisuke · Michishio, Father · Imaruoka, Atsushi. Seto, San · Momoi, Haruko · Michishio, Nagasumi · Mizushima, Takahiro. Shiranui, Akeno.