Birthday
September 29
Sachi Mizuiyama (水井 山 幸) is a character featured in Danganronpa Kirigiri, debuting in the third volume and became a reccurring character in the following novels. Sachi is a 7th-rank detective specializing in technological crime and also specializes in architecture, as the first two digits of her number speak of - DSC 527. She was one of the few detectives summoned to take part in the Duel Noir at the Takeda Haunted Mansion. She survives and becomes one of the allies of Yui Samidare in stopping the Victims Catharsis Committee, taking on the Museum of Medieval Torture Devices Duel Noir. However, in actuality, not only is she one of the culprits of the Twelve Duel Noir Challenge set up by Gekka Ryuzoji, she was also a devotee of his and didn't want him to step down. She is the culprit of the Libra Girls Academy Duel Noir and does her best to sabotage Yui's group. In the end, she is foiled by Salvador and the Mystery Research Club he brought with him, leading to her arrest.

Danganronpa
A group of 15 elite high school students are gathered at a very special, high class high school. To graduate from this high school essentially means you'll succeed in life, but graduating is very difficult. The school is presided over by a bear called Monokuma, and he explains to them that their graduation hinges around committing a murder. The only way to graduate is to kill one of your classmates and get away with it. If the other classmates discover the identity of the killer, the killer is the only one executed. However, if they fail to catch the killer, only the killer graduates and the others are annihilated. Which of the 15 will survive the bloodbath to come?