Ai Ikusaba (née Mikami), is one of the Seventh diary owners, which is shared with her boyfriend/husband Marco Ikusaba. Devoted to Ikusaba, Ai and Marco share the "Exchange Diary", which the couple uses to keep an eye on each other at all times. They wish to become Gods so they can be together for all eternity. Ai is a beautiful young woman with shoulder-length dark blue hair and purple eyes; while infiltrating the Omekata religion, she often covers her right eye with her bangs. She normally wears a light blue sleeveless jacket and white pants. From a young age, Ai loved Marco after he befriended her and gave her a family after she was abandoned by her parents as a child (in the anime, she is also grateful for his efforts to prevent her from being sexually assaulted in their high school years). She is very devoted to him, and together they form a strong battle couple. Ai is implied to be a flirtatious person, since the Apprentice Diary she gained, the "Flirting Diary", involved identifying the men she would flirt with. She seems to be at peace with Marco's constant fights, but she is extremely insecure about their relationship; even the vaguest hint of infidelity on Marco's part is enough to send her into hysterics. Marco and Ai share the Exchange Diary, a pair of mobile phones that predict each other's future. Its main advantage is that Ai can predict her own future or Marco's, depending on which phone she uses; however, she generally prefers the latter method so she can protect Marco from danger. While a fearsome combination, the Exchange Diary becomes much less effective if Ai and Marco are separated; additionally, while she would survive unharmed if Marco's phone is destroyed, it would still effectively negate the advantage of her Future Diary.
The Future Diary
Lonely high school student, Yukiteru Amano, spends his days writing a diary on his cellphone, while conversing with his two seemingly imaginary friends Deus Ex Machina, who is the god of time and space, and Murmur, the god's servant. Revealing himself to be an actual entity, Deus grants Yukiteru a "Random Diary," which shows highly descriptive entries based on the future and forces him into a bloody battle royale with 11 other holders of similarly powerful future diaries. With the last person standing designated as the new god of time and space, Yukiteru must find and kill the other 11 in order to survive. He reluctantly teams up with his obsessive stalker Yuno Gasai (who also possesses such a diary), and she takes it upon herself to ensure his safety. But there's more to the girl than meets the eye, as she might have other plans for her unrequited love...
