Cosmonaut is the sixth studio album by Bump of Chicken, released on December 15, 2010.

The album features the singles "R.I.P./Merry Christmas" (without "Merry Christmas"), "Happy", "Mahō no Ryōri ~Kimi Kara Kimi e~", and "Uchūhikōshi e no Tegami/Motorcycle".

All tracks are written by Motoo Fujiwara

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