Bun wo Tsuzuru

Sasamura is curious about a new transfer student, Ayano Otsuka, who has beautiful handwriting. Otsuka comes to Sasamura family's stationery store and tells him that she wants to send some letters, which is unusual these days. Sasamura wants to make friends with her, but Otsuka has a secret she can't tell anyone... (Source: Shonen Jump Plus, translated)