Once More

Yuuki and Shun are boyfriends.
Yuuki has a chronic illness.
Shun is chronically unmotivated.
One day Yuuki tells Shun, "I need to talk to you."
They meet in the park.
And what begins there is----

A time loop boys love game.
Repeat the same day to lead them to their true end.

[Rough translation from the official site]