Mirai Nikki began as a manga by Sakae Esuno, serialized from 2006 to 2010, before the television anime adaptation aired in 2011. Also released as Future Diary, it follows Yukiteru Amano and Yuno Gasai in a deadly battle royale where each contestant uses a diary that predicts the future. Yuno became one of anime's most recognizable yandere characters, which helped clips from the series spread in edits, reaction videos and soundboards long after the original broadcast, especially for jealous, suspenseful or unhinged moments.