Accompanying Mano and Nakai at the water park are their classmates Nishikata and Takagi. As they ponder their first activity, Nakai suddenly whisks Nishikata away, leaving behind his disappointed girlfriend with Takagi. It turns out Nakai agreed to take a ride down the love-inducing water slide with Mano. Predictably, Takagi concocts a clever scheme to reunite the pair while seizing the opportunity to playfully taunt Nishikata.