Kimi wo Hitori ni Shite Agenai

Chigusa has difficulty expressing herself and often keeps others at a distance, leaving her isolated at school. One day, a strikingly handsome boy joins her class, and to her shock, he is Iroha, the only childhood friend she ever had. Iroha reveals he transferred to the school specifically to see her. Despite the emotional barriers she has created, he gradually bridges the gap between them.