Hey, do you know? The lifespan of love is three years. Then how about the lifespan of casual sex? Shall I teach you? When Shizuma, recently dumped by his girlfriend, wakes up next to Minato but claims to not remember a thing about their night together, Minato becomes offended and plans to "seduce and dump" the straight guy. But his revenge doesn't go as smoothly as planned, because it's not just Shizuma who ends up falling... A spin-off of Secret XXX featuring Shouhei's older brother Shizuma and Mito's younger brother Minato.