The World's Greatest First Love, Vol. 16 (世界一初恋 (The World's Greatest First Love) #16)
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?
Ritsu realizes it was Takano who helped him when he collapsed—not Nao, as he previously thought! Now Ritsu decides that he’s finally going to tell Takano how he feels, but first he has to tell Nao, who has a crush on Ritsu, that he and Nao can’t live together anymore. Will Ritsu be able to go through with it and finally confess to Takano?