Rika Furude and her group of friends live in the small mountain village of Hinamizawa; in June 1983, they welcome transfer student Keiichi Maebara into their ranks, making him the only boy in their group. After school, they have fun playing games and spending each day living their lives to the fullest. Despite this seemingly normal routine, Keiichi begins noticing strange behavior from his friends, who seem to be hiding the town's dark secrets from him. Elsewhere, a certain person watches these increasingly unsettling events unfold and remembers all the times that this, and other similar stories, have played out. Using that knowledge, this person decides to fix these broken worlds. However, when certain variables change, the individual is faced with a horrifying realization: they have no idea what to expect or how to stop the impending tragedy. [Written by MAL Rewrite]

The Future Foundation is in shambles after the Final Killing Game and the revelation of the true culprit. As a desperate plot arises from one of the survivors to rid the world of despair once and for all, the remaining Future Foundation members must band together to stop this atrocity from taking place. Fortunately, they find themselves with help from a group of unlikely allies as they race against the clock to stop their world from being changed. In this finale to the Hope's Peak storyline of the Danganronpa series, the players in this neverending death game begin to understand the true meaning behind despair, hope, and atonement. [Written by MAL Rewrite]

Episode 13 of Acchi Kocchi that was included in Vol.6.

Buntarou doesn't know what he wants to do in the future. He does not have any kind of dream that he wants to pursue, so currently he just spends his days hanging around with his friends. One day, his classmate Sayuki asks him if he wants to help with development of a gal game. She says that she had become interested in his help after she read one his works intended for the drama club. Buntarou doesn't know anything about gal games, but Sayuki claims that she has the ability to make it a success. Can they make the game and will it be a success like she claims it will be? This is the story of youths taking a daring step into the unknown... (Source: Otaku Lair)