The B-side 'Sirius' on Eir Aoi's 2014 single "Tsunagaru Omoi" would later be used as the opening theme for the anime series Kill la Kill. This single followed her second album "Aube".
- "Tsunagaru Omoi" was released on November 12, 2014, by Sony Music Labels Inc.
- The single reached number 14 on the Oricon Weekly Singles Chart.
- "Sirius" was later included on her compilation album "Best Eir Aoi".
Eir Aoi is a pop singer from Sapporo, Hokkaido, Japan, best known for her anime theme songs. She debuted in 2009 and rose to prominence in the early 2010s.
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