"Kyōshinshō" (狭心症, "Heart Attack") is a song by Japanese rock band Radwimps, released on February 9, 2011 as the second of two singles preceding the band's sixth album, Zettai Zetsumei.

The song is a slow tempo rock song. It begins with a sparse arrangement of electric guitar and drums set to the same beat, along with Yojiro Noda's vocals. The song gradually adds more complex arrangements of drums, guitars and bass instruments, and reprises the sparse arrangement at the end of the song.

The lyrics of the song are a discourse by Noda, who states that it is good that he only has two eyes, as otherwise he could not keep living if he had to see all of the "grief of the world." In the chorus, he urges people to "carry a thread and needle" to sew up their eyes, so they can no longer see such grief and remain innocent. The lyrics further mention the Russian folk character Ivan the Fool.

The song took half a year to write by Yojiro Noda, and was pieced together from guitar chords and lyrics in his head.

Yojiro Noda appeared by himself on Tokyo FM radio program School of Lock! on February 2, 2011, as a revival of the band's Radlocks! radio show. The band were also interviewed in Rockin' On Japan's March issue to promote the single, as well as "Dada."

The music video was directed by Kensaku Kakimoto who had previously not worked with the band on a music video before.

The video depicts the Yojiro Noda at night time in a playground, as he pushes a girl with a blindfold and headphones in a wheelchair through the park. The girl holds a flash light as they move. Through the park, the pair pass a facially deformed man and men who are fighting. Further through the park is a makeshift slum, where they pas a man on fire. The sky begins to dawn, and the people around Noda and the girl are shot. A man sets a car on fire, and is later shot down by a group of men with guns. Near the end of the song, the pair come up to a pile of bodies and severed limbs, along with people crying over their bodies. The rest of the band members perform the song in this scene. Noda leaves the girl to close the eyes of a dead boy, and covers him with his jacket. The girl gets up from her wheelchair, and drops her flash light. She screams, removing her headphones and blindfold to reveal that her eyes have been sewn shut.

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Wikipedia