
Quick answer — Spyair performed 4 anime themes, including "HAIKYU!! TO THE TOP - Ending 2 | One Day" from HAIKYU!! TO THE TOP Part 2, "Imagination" from HAIKYU!!, "JUST ONE LIFE" from Samurai Flamenco.
Spyair performed the anime theme songs "HAIKYU!! TO THE TOP - Ending 2 | One Day" (HAIKYU!! TO THE TOP Part 2), "Imagination" (HAIKYU!!), "JUST ONE LIFE" (Samurai Flamenco), "Samurai Heart (Some Like It Hot!!)" (Gintama Season 2).
Spyair's first listed anime theme is "HAIKYU!! TO THE TOP - Ending 2 | One Day", the ending of HAIKYU!! TO THE TOP Part 2.