Shishunki no Obenkyou – Episode 1 (EN)

During a quiet classroom test, Kaede Kasuga finds herself completely distracted. Instead of focusing on math problems, her thoughts fixate on one forbidden question: what exactly is hidden in boys' crotches? The mystery of the penis consumes her, making concentration impossible and resulting in a perfect zero on her exam.

The boy seated behind her, Kobayashi, notices her blank paper and teases her mercilessly. Flustered and determined to prove herself, Kaede challenges him to a score battle on the next test. Kobayashi ups the ante with a high-stakes wager: the loser must obey one absolute command from the winner—no limits.

Though hesitant at first, Kaede agrees when she realizes victory could grant her deepest wish: to finally see a real penis up close. Fueled by this secret motivation, she throws herself into intense "study" sessions, but her efforts are anything but ordinary. As her curiosity drives her toward risky experiments and intimate encounters, the line between learning and lust begins to blur in this provocative tale of adolescent exploration.