ココロ (Kokoro)

Background
The song tells a story about a robot (Rin) made by a lonely scientist, but is missing a program unable to be made: a Heart. Some time after her creation, her scientist passes away, leaving her alone for several hundred years. She begins to wonder about her creation and makes a wish. She accesses the files that her creator had left and finally gains a Heart. In the process, she discovers what it's like to be happy and sad. With her new feelings, she gratefully dedicates all of the songs that she sings to her creator. In the end, the miracle robot had a short in her system and could no longer sing. However, she had a smile on her face in her last moments, resembling an angel.

Many PVs present Rin's scientist being Kagamine Len.

This song is featured in the Miku no Hi Dai Kanshasai 39's Giving Day concert, the MikuPa Live in Tokyo 2011 concert, the MikuPa Live in Singapore 2011 concert, the MikuPa Live in Tokyo 2012 concert, the MikuPa Live in Hong Kong and Taiwan 2012 concert, the MikuPa Live in Sapporo 2013 concert and the MikuPa Live in Kansai 2013 concert; also in the games -Project DIVA- 2nd, -Project DIVA- Arcade and Miku Flick/02 (DLC). It has also been featured in a stage play and a novel adaptation.

Piano sheet music appeared in the ピアノソロ やさしくひける ボーカロイド Selection for Piano collection. This song has also appeared as sheet music in the VOCALOID Best Selection series.

This song is featured in the EXIT TUNES compilation album Vocalostar.

Novel Adaptation
Toraboruta-P announced that on April 27, 2012; (previously it's stated to be April 17, but it was delayed) he will release his novel entitled "Kokoro"; a novel based on the song.

The novel is written by Katsuyoshi Ishizawa (the same writer who wrote for the Kokoro stage play); and illustrated by Nagimiso.SYS; illustrator most notable for his PV of "Roshin Yuukai" also a card illustration by redjuice. The price is 1,200 yen and was available for purchase in Amazon on April 27.

A crossfade of the novel ("Kokoro" arrangement by Toraboruta-P and video by Nagimiso.SYS) can be seen on niconico and YouTube. A month after the novel was put on sale on Amazon; it was announced that the "Kokoro" Novel have sold out and could no longer be purchased from Amazon. There is currently no news of second waves of printing; however it has sold faster than expected.

Derivative Works
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Concert Performances
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Game PVs
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