Quick answer — ChouCho performed 1 anime theme, including "Natsu no Hi to Kimi no Koe" from Glasslip.
ChouCho performed the anime theme songs "Natsu no Hi to Kimi no Koe" (Glasslip).
ChouCho's first listed anime theme is "Natsu no Hi to Kimi no Koe", the opening of Glasslip.