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Citrus is a Japanese yuri manga series written and illustrated by Saburouta. The series was serialized in Ichijinsha's Comic Yuri Hime from November 2012 to August 2018 and is licensed in English by Seven Seas Entertainment.

Yukiteru "Yuki" Amano is a loner who spends most of his time writing a diary on his cell phone or talking with his imaginary friends Deus Ex Machina, the God of Time and Space; and Murmur, Deus' servant. One day, Deus gives Yuki a special diary, mentioning something about a game.

The game is set at a special, elite high school called Kibagamine Academy (lit. Hope's Peak Academy) which only accepts students of the highest caliber in various fields.