Oshigama is an abbreviation for to hold back your pee. More and more people are becoming addicted to the liberating feeling of releasing pee after holding back to the limit. [Synopsis] One afternoon, on her way home from shopping, Kana couldn't find her key at the door and couldn't resist, so she leaked it. His nephew Kazuya, who lives nearby, happened to see him. Ever since that day, Kazuya has been unable to let go of Kana's shameful state.