Zutto Otokonoko da to Omotte ita Gakitaishou ga Onnanoko deshita
ずっと男の子だと思っていたガキ大将が女の子でした
After reconnecting with his childhood friend, he learns that she was never a boy as he had believed, but a girl who has matured into an attractive young woman. She looks after him, and they spend time together, including a visit to the park, where they experience a mix of pleasant and awkward moments.
