Imomushi Shoujo to Komyushou DanshiCaterpillar Girl and Bad Texter Boy; La jeune fille chenille et le garçon banal; 芋虫少女とコミュ障男子

This manga follows a socially awkward boy and his childhood friend who is beautiful, smart, kind, and just about perfect in every way. However, the boy turns down her confession of love. A few days later, the girl goes missing, only to reappear before the boy a few days later, after shedding her human form