Watashi wo Hitorijime ni Shite

Two classmates, Hina and Mitsuki, keep their relationship a secret. Hina gives them both matching keychains as a gift, hoping to keep Mitsuki exclusively for herself. When Mitsuki touches the keychain, she discovers a hidden wiretap inside. The second story follows the same characters as they grow older, showing how some aspects of their bond remain unchanged despite the passage of time.