Reisuke tries several times to kill Yuki and Yuno, but the two of them thwart his attempts, soon realizing he is a diary owner. Yuki starts searching for Reisuke's diary in vain, while Yuno insists killing him would be faster. While chasing Reisuke with a hammer, Yuno ends up injuring Yuki's mother instead. Yuno figures out that Reisuke has posted his diary to himself in order to hide it and has Yuki intercept the delivery, but he falls prey to a poison gas trap hidden in the envelope. Reisuke challenges Yuno to a hide-and-seek game inside the poison gas filled house, promising the antidote if she manages to capture him. Yuno evades numerous traps set by Reisuke, but eventually finds herself at his mercy. However, Yuki intervenes, injuring Reisuke with a dart and giving Yuno the resolve and opportunity to finish him off. Yuno and Yuki collapse before managing to use the antidote, but Uryu, who has been informed about the situation from Keigo, appears and saves them. Before leaving, Uryu tells Yuki not to trust Yuno.

While the police surrounds the hospital, Uryu takes Keigo's wife and son hostage and tries to bargain with him. However, Keigo is convinced the only way to save his family is to win the survival game and refuses to negotiate. Yuki gets captured by the police, but as Keigo takes hold of him, Yuno appears, holding a grenade. Even when Keigo agrees to let Yuki go, Yuno decides to detonate the grenade, reasoning she'd rather die taking out Keigo than not be with Yuki. The grenade turns out to be a flash bang, knocking everyone out. Meanwhile, Uryu tries to escape the hospital, only to run into Nishijima. She tells him about the deal she and Keigo made and how he framed Yuki and Yuno, and they both rush back to the hospital. Yuki regains consciousness and tries to shoot at Keigo, but he uses Yuno as a shield. Despite his diary predicting he will kill Yuno if he shoots, Yuki refuses to give up, proclaiming his love for her. The future somehow changes and Yuki gets a clean shot at Keigo. Uryu arrives with Nishijima, who places Keigo under arrest. Since he's no longer a detective, his Investigation diary stops predicting the future. After learning his family has been rescued, Keigo asks Uryu to take care of his son, apologises to Yuki and breaks his own diary, removing himself from existence. Yuki and Yuno are exonerated thanks to files Keigo left behind, while Uryu escapes yet again. A few days later, Aru sends Yuki a text message warning him about Yuno, but she intercepts and deletes it.