"Sorairo Days" was Nakagawa's fourth single, released in 2007, and served as the opening theme for the anime series "Tengen Toppa Gurren Lagann."
- The single reached number 5 on the Oricon Weekly charts.
- It was also released as a limited edition with a bonus DVD.
- The song has become one of Nakagawa's most recognizable and enduring hits.
Shoko Nakagawa is a Japanese singer, actress, and television personality. She rose to fame in the mid-2000s as a pop and rock singer with a strong anime tie-in presence.
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