The Pure Love Starting from The End

Chiaki re-encounters his friend & unrequited love, Keita who came to buy wedding rings at the store where he works. When Keita got rejected & dumped by his girlfriend, Chikai was the one to comfort him, even though Chiaki had long given up on expecting to be loved or any dream of a happy relationship & have casual flings. But meeting with Keita again is weakening his resolve. Will he able to love someone for eternity?