Book — Shungiku Nakamura

When Ritsu Onodera changes jobs, looking for a fresh start, he's not exactly thrilled when his new boss turns out to be his old flame. Ritsu's determined to leave all that in the past—but how can he when his boss is just as determined that they have a future?
Overworked Emerald manga editor Ritsu Onodera is still stuck reporting to tyrannical editor in chief Masamune Takano, Ritsu’s first love! Recently, work has been going fairly well for the rookie editor—but then his lack of confidence causes him to panic. To add to his anxiety, his ex-fiancée, An, asks him point-blank if he’s in love with Takano! If it’s that obvious to her, who else may have noticed?!