super_danganronpa_2.5:_komaeda_nagito_to_sekai_no_hakaimono
Danganronpa (series) OVA included with the Japanese limited edition of Danganronpa V3: Killing Harmony. It regards Komaeda Nagito and his "ordinary" life, which soon gets turned upside down by an entity only known as "The World Destroyer".
Set between Danganronpa 2: Goodbye Despair and Danganronpa 3 (anime).