Kyosuke Sasaki finds himself trapped in a time loop, reliving the summer vacation of his first year of high school.

After countless repetitions, he eventually lost all desire to do anything. To kill time during the loop, he devises a plan: woo multiple girls throughout the summer and confess to all of them on the final day.

On the final day of summer vacation, after confessing and receiving affirmative responses from several girls, he fell asleep, satisfied and ready for the next loop.

However, the next loop never began; the time loop had ended.

Kyosuke rejoiced that the loop had ended, but he was left with one significant problem: he was now dating multiple girls!

The women, each vehemently claiming to be Kyosuke Sasaki's one and only girlfriend!

A dramatic scene erupts right before his eyes!

Kyosuke, clutching his head, wondering how he ever got into such a mess!

With the repeating loop finally over, the real drama begins.