Eternal Summer

 is Maruyama Karin's first and only single that was released before she died. The single charted for 4 weeks on the Oricon chart with a peak position of 66. It reached a peak position of #7 on the indies chart.

The single was re-released on August 23, 2017 titled Eternal Summer -Special Edition- which contained a DVD disc of live performances.

CD

 * 1) Eternal Summer
 * 2) Anata to Watashi (あなたと私; You & I)
 * 3) Eternal Summer (Inst.)
 * 4) Anata to Watashi (Inst.)

Special Edition DVD

 * 1) Eternal Summer
 * 2) Eternal Summer アコースティック LIVE
 * 3) あなたと私 アコースティック LIVE

Information

 * Eternal Summer was written by CHEEBOW
 * Anata to Watashi was written by Kanazaki Shun