Zenbu, Hajimete (ASAKAWA Sai)

Haruto, heartbroken after discovering his ex-boyfriend was married, is drinking heavily at a bar when he meets a man who has also experienced heartbreak. They hit it off immediately, and before he knows it, he's in bed with this man whose name he doesn't even know..? Haruto leaves, keeping quiet about the one-night stand, but then, unexpectedly, his ex-boyfriend, Hayama Shiori, is transferred to his company. And then, Hayama starts showering him with intense affection..?