A series of side stories of Durarara!! bundled with the first press release of all 13 DVD volumes of 1st season of anime

A series of Durarara!! short stories that come with each Durarara!!x2 Limited Blu-Ray and DVD pack.

Danganronpa: Trigger Happy Havoc IF: The Button of Hope and the Tragic Warriors of Despair is a light novel written by Ryōgo Narita. It explores what would have happened if Makoto Naegi had received the Escape Button from the MonoMono Machine in the beginning of the game, which helps him slowly regain his memories. It is unlocked after completing Danganronpa 2: Goodbye Despair.

While all of Japan focuses on the possible record-breaking baseball play in the stadium, underneath the wild tension, another game is at play. A mysterious murder takes place and the director of the Natsugawara Stadium, the executive Ryuusei Takioka and the senator Ranzou Hiura try to hide this mystery before the mass media ruins their elite status. Unfortunately for them, a certain infamous informant in a wheelchair happens to be at the game, and the hidden murder mystery becomes more deadly for all those involved.

This is a four-part Durarara!! series made for Niconico and the 10th anniversary of Durarara!! and 20th anniversary of Dengeki Bunko. They take place after Vol. 13's events. There are spoilers for the end of the novels. This series also serves as a prequel to Durarara!!SH.