One evening, you get quite drunk at a social gathering for your university club. A senpai in the club who lives in the same direction as you ends up escorting you home. There are bad rumors about him and at first, you keep your wits about you. After he buys you some mineral water and treats you kindly, however, you lower your guard.
And that's all you remember. It would seem you lost consciousness after that. Having difficulty breathing you awaken to find that he is deep kissing you. You try to resist, but your arms and legs are restrained and you cannot be moved. With a manic flair in his eyes, your senpai speaks to you. "I'm going to make you cum until you faint."

Official English Translation