After having to deal with jealousy from his co-workers for working under his father's name, prideful literary editor Ritsu Onodera is determined to establish himself in the industry. To accomplish this, he quits his job at his father's publishing company and transfers to Marukawa Publishing. But instead of being placed in their literary division, Ritsu finds himself working as the rookie manga editor for the Emerald editing department, a team that operates under extremely tight schedules in order to meet deadlines. There, Ritsu is introduced to the infamous editor-in-chief Masamune Takano, a persistent man who strives for results. As it turns out, Takano is actually Ritsu's high school love, and it is the aftermath of that heartbreak has caused Ritsu's reluctance to fall in love again. Now with the two reunited after several years of separation, the reestablishment of their relationship is marked by Takano's vow to make Ritsu say that he loves him again. Sekaiichi Hatsukoi follows three couples that are interconnected within the manga industry, with each being subject to the budding of first love.

Chako Ishibashi is a normal middle schooler at a normal school having normal school days. However, there is one oddity in Chako's everyday life—the student sitting at the desk next to her, Shibainuko-san. What is it about her that Chako finds strange? The answer is simple: Shibainuko-san doesn't look like a human at all. Instead, she looks just like a Shiba Inu! Polite, well-meaning, and with the mannerisms of both a dog and a human, Shibainuko-san is loved by all. However, Chako notices that her classmates seem oblivious to Shibainuko-san's physical appearance. Can a dog go to school and be a normal student? Join Chako and her best friend Naho on bite-sized misadventures with their unusual classmate, who may or may not actually be a dog.

Life is idyllic and unassuming in the small town of Sotoba, a simple place where everyone knows everyone. However, tragedy strikes when Megumi Shimizu, a young girl with high aspirations, unexpectedly passes away from an unnamed illness. Over the torrid summer months, as more unexplained deaths crop up around the village, the town's doctor—Toshio Ozaki—begins to suspect that something more sinister than a mere disease is at play. Toshio teams up with Natsuno Yuuki, an apathetic and aloof teenager, and siblings Kaori and Akira Tanaka, two of Megumi's friends, to unravel the dark mystery behind the deaths in Sotoba. With their combined efforts, the investigation leads them toward an eerie secret pertaining to the new family in the Kanemasa mansion.

The 6 short Chibi Style Specials on each of the Blu-rays/DVDs.