``My voice...is leaking.'' The sound of water echoes lewdly in the small private room as the senior's skillful caresses begin. Even though I know it's not good, my body reacts sensitively... What should I do, even though my boyfriend is waiting for me at home... !――After missing train, Yui reluctantly decides to spend the night at a manga cafe, where she meets Tachibana Senpai, who is popular with the female employees.Moreover, there are no rooms available, so it's just the two of them in the same room! When her boyfriend calls, she ends up lying and saying she's staying at a friend's house.Then, her usually kind-hearted senior suddenly changes and says, ``Why did you lie?We didn't come here to do anything naughty.'' ” and was pushed down...!?