Delay in Love Is Dangerous.
Chiaki Yoshino, a highly successful young female manga artist who had just finished a big project, made plans to go out with her childhood friend and editor, who also happened to be her boyfriend, Yoshinori Hatori. However, on the day of their outing, Hatori had to cancel due to a sudden work emergency. Yoshino reluctantly decided to go out alone, but while wandering around the city, she coincidentally saw Hatori with another woman...!?
Aired 29/10/2011EP 4 - Delay in Love Is Dangerous.
Sekai Ichi Hatsukoi - The World's Greatest First Love Season 2
First loves are messy. While settling in as a shoujo manga editor at the famous Marukawa Publishing House, Ritsu Onodera is quite troubled. Working under the stern and superb Masamune Takano is hard enough as it is. However, Masamune is not only Ritsu's first love from middle school but he also suddenly declares that he will make Ritsu fall for him again.
Unknown to them, another editor in the department, Yoshiyuki Katori, is in a relationship with the popular manga artist Chiaki Yoshino. The carefree Chiaki fails to notice, however, that his high school friend—Yuu Yanase—thinks of him as more than a friend. The stoic but caring Hatori will not surrender his love so easily.
Falling in love for the first time when you are 30 is certainly troublesome. Shouta Kisa, yet another editor, is going out with 21-year-old Kou Yukina, an art student. Despite Yukina's assurances, Kisa cannot help but doubt whether someone like himself is truly worthy of his younger, "sparkling" boyfriend.
(Source: MAL Rewrite)