At a wedding's after-party, Mao won an adult toy in a bingo game. On a whim, they tried it out, but Kana wasn't particularly interested. In the end, they decided to get rid of it, but later discovered that Kana had secretly been using it alone. After finding out, Mao mischievously began spying on her, asking, "How should I use it? Show me how you do it by yourself?"