Summer is almost here. The eastern pale clouded yellow (Colias erate) has been seen sometime in the city of Kofu in Yamanashi Prefecture, Japan.
Eastern pale clouded yellow (♀), Arakawa River, Kofu, Yamanashi, 6/09/2025
https://en.wikipedia.org/wiki/Colias_erate; https://www.ifoundbutterflies.org/colias-erate
Japanese bindweed (Calystegia pubescens)
Japanese bindweed, Arakawa River, Kofu, Yamanashi, 6/09/2025
Also, please visit the article on May 26, 2025, Calystegia pubescens, A Weedy Wildflower, https://yamanashietsuo.net/wp-admin/post.php?post=5407&action=edit