is a light novel series by Kyouhei Iwai, with illustrations by Ruroo. There is also a short story light novel series called Mushi-Uta bug that is serialized in The Sneaker magazine. A manga adaptation by Seijuro Miz is serialized in Shōnen Ace magazine. An anime television series adaptation directed by Kazuo Sakai began airing on July 5 2007. A second 12-episode season was announced on September 5.
Mushi-Uta's story takes place in the near future. Ten years before the story's opening, strange insect-like creatures known as "Mushi" began appearing. The Mushi are able to consume peoples' dreams and thoughts in return for supernatural powers. At the end of episode one, protagonist Daisuke "Kakkō" Kusuriya encounters a young girl named Shiika Anmoto. The two, in time, become quite close. However, unbeknownst to Kakkō, Shiika is an escapee from a secret prison known as GARDEN where those possessed by the Mushi, known as the Mushitsuki, are held. GARDEN's military force, the Special Environmental Conservation Executive Office, dispatches its finest killer to track down Shiika. However, they are faced with resistance from the Mushibane resistance organisation, led by the secretive "Ladybird".
- The main protagonist, it is believed that he is the strongest host in SEPB. His alias is . Years ago, he shot Shiika's mushi, and promised her to make her dream come true. However, he does not seem to realize that Shiika was the girl he made the promise to. He has a sister named Chiharu, whose whereabouts are currently unknown. His mushi power manifests in powering a gun he carries. It is hinted that the more powerful he makes the bullet, the more his dreams or energy is drained.
- Thought to be one of the most dangerous host. Her mushi, , was killed by Daisuke years prior to the main story. After she regained her memories and emotions, she escaped GARDEN, and was found by Daisuke. She now lives in Rina's house and goes by the alias within Mushibane. Her mushi power is unspecific where the mushi shines like a bright ball and is able to cause heavy impacts with high velocity tackles. Furthermore, it can create a snow storm that kills other mushi in it, presumably by high atmospheric pressure. She is stabbed by a mushi and ends up in the hospital. At the end of season 1, Kakkou tells her to wait for him at the astronomy building.
- Daisuke's classmate, and the leader of Mushibane. After seeing Shiika, she let her stay in her house. She has a crush on Daisuke, unaware of his true identity or his feelings for Shiika. According to Daisuke, she reminds him of his older sister. Her alias is and her mushi power is to summon her giant ladybug nicknamed "Nanahoshi" (means 7 stars). She is able to ride Nanahoshi to fly. Her most powerful attack used on a berserk Centi seems to be a highspeed sonic slash.
- Leader of the SEPB branch on Ouka city. His sister lives by eating away his dreams, a fact only known to him and Daisuke.
- Haji's ditzy secretary. She mainly serves to lighten the mood when Haji and Kakkō (or other SEPB members) are talking in a serious tone.
- A double agent working for both Haji and Mushibane. Her true intention is to defeat Kakkō and take his place as Haji's right hand, whom she is in love with. Her alias is , and her mushi power involves spying as her cicada acts as a tapping device. It also has the ability to shoot small lasers and somehow grants Minmin the power to fly and float. Her mushi is later killed by Shiika's mushi, Fuyuhotaru.
- Mysterious parasites that appeared ten years ago. Feeds off the dreams of its human host and provides supernatural powers in exchange.
- People who have been infected by Mushi. Once possessed, the Mushi will feed until its host dies.
- Hosts whose Mushi has been killed become Fallen. They lose their dreams, memories, emotions and are unable to do anything of their will unless ordered. It is possible for them to regain memories and emotions after having their Mushi killed.
- Also known as SEPB, is an organization established by the government that employs Hosts to capture other Hosts, in order to prevent existence of Mushi from being known.
- A resistance force comprised of Hosts fighting against SEPB for the sake of freedom.GARDEN
- A top-secret facility created by the government to quarantine the Fallen.The "Original Three"
- Three mysterious characters believed to be the whole source of the mushi phenomena, as apparently everyone who became a host, had encountered one of them before doing so. Neutralizing these individuals is the top objective of the SEPB. Later is revealed that the true objective of the Originals is to eat the dreams from other hosts. So far the only original appeared is named the "Voracious Eater", a woman who has a giant moth as a mushi, which can generate smaller versions of itself to eat the dreams of other hosts.
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- * Vocal: Akatsuki
- * Lyrics: Bee'
- * Composition: Katsuhiro Kurosu
- * Arrangement: Katsuhiro Kurosu Ending theme:
- * Vocal: Hiromi Satō
- * Lyrics: Hiromi Satō
- * Composition: Hiromi Satō
- * Arrangement: Masaki Suzuki