Two unaired episodes included in the DVD Set release of Tonari no Seki-kun series. #1. Field Trip (Rinkan Gakkou) (first volume) #2. Snow Playing (Yuki Asobi) (second volume)

During her summer holiday at her grandparents house Tamai Shiina, a young and cheerful schoolgirl, meets a strange looking creature. They befriend each other and Shiina names it Hoshimaru: The Round Star. When Shiina returns home after the summer to go back to school, she starts meeting other kids that also have befriended a strange creature like Hoshimaru. But she soon finds out that not all these creatures and their masters are as friendly as Hoshimaru. (Source: ANN)

Yokosuka Girls' Marine High School is bustling as they welcome other all-girls maritime high schools for interschool competitive games. Full of excitement, students from different years gather and interact with one another as the festivals and tournaments commence. In the meantime, mixed feelings fill Akeno Misaki—captain of the distinguished Harekaze class—and her executive officer Mashiro Munetani when their instructor informs them of an opportunity for Mashiro to lead the Hiei class. As a result, Mashiro needs to make the difficult decision soon, and Akeno needs to confront the state of the situation. The pair face another challenge after Yokosuka finds itself in another pinch. A group of pirates has captured a water purification plant and sea fortress, threatening the safety of the sea. Akeno and Mashiro now must command the Harekaze class in the midst of a dire predicament—all while dealing with their own difficulties.

The story continues where it left off at season 1, but now we start to get to know the people we already know a little more in detail. (Source: ANN)