User Ranking: n.2
Kind of Diary: Diary of Love
Seiyuu: Murata Tomosa
She loves: Yukki
She hates: who hurts Yukki
Personality: yandere... it's all explained! XD
The main female protagonist and the Second Diary user. Smart, beautiful, and diligent, to most students she is seen as the model student but in reality, she is secretly obsessed with Yuki and constantly stalks him. Having Yandere-like tendencies, she is so obsessed with Yuki that she is willing to hurt or kill anyone who hurts him and is constantly jealous if anyone other than her is getting close with Yuki to the point she won't hesitate to sacrifice them because to her, the only important thing is that she and Yuki survive the game. Her diary is the Yukiteru Diary, a diary which gives her details whatever Yuki is doing in the present every 10 minutes. Because it only focuses on Yuki, her diary does not detail anything about her unless it has to do with Yuki. But working together with Yuki's Random Diary, they are able to solve their diaries' weaknesses.
Yuno's behavior was the result of her parents, who used to be loving parents before becoming demanding and pressuring their daughter to be the perfect citizen to the point they would lock her up in a cage and only allowed her certain amount of time for her to sleep and how much food she ate. Their treatment drove Yuno insane up to the point that she locked her parents in the same cage, hoping they would realize how she felt and change back to their old-selves only for them to die of hunger. To hide her parents' death, she made a cover story that they were working over-seas but Yuki would later learn about this as well as the truth after Aru Akise investigated the bodies. Yuno's origins are further explored, revealing she originates from a parallel universe where she was the victor of the game, but was driven when she resurrected Yuki but not his soul. This prompted her to travel to Yuki's universe where she murdered that universe's Yuno and took her place.
When the truth of her identity is exposed, she travels to another universe to start all over again but she is thwarted by Yuki and Minene when they traveled back in time to that universe and change the terrible past of the contestants including Yuno's and prevented the diary game from happening. Trapped, she comes to the belief that she was merely using Yuki and tries to rid herself of him by sealing him in a illusionary world using her godly powers. However, Yuki breaks free just as Yuno realizes she does love Yuki and she kills herself to let him wins the survival game. However, thanks to Deus of the new universe, Yuno's memories are implanted into her new universe counterpart, allowing Yuno and Yuki to reunite.
She is named after the Roman goddess Juno.