僕らはなんども恋をする (Bokura wa Nando mo Koi o suru)

Plot

Don't die!! I have yet to tell you I love you. Salaryman Issei and self-styled cameraman, Ban are sex friends. He loves Ban but is unable to tell him his feelings. Despite this, their relationship continued for a year. But just when Issei was about to confess his feelings, Ban died in an accident. In despair, Issei fell down a staircase and went back in time before Ban died...!?