There is no OVA Episode 23 for Boku no Pico . The official animation production by Natural High stopped after the third OVA. References to an "Episode 23" are usually internet memes or jokes intended to confuse people who are not familiar with the series, or they may refer to edited fan videos posted on video-sharing sites.
The series also explores the tension between free will and determinism. Pico's actions are often depicted as being influenced by external forces, such as her family and societal expectations. However, she also exhibits moments of agency and self-determination, suggesting that she is capable of making choices that shape her own destiny. This tension is reflected in the series' use of symbolism, particularly the recurring motif of the "pico" doll, which serves as a symbol of Pico's own identity and autonomy.