When Ito wakes up in the morning, her coworker Yui is standing next to her in her underwear!? "Yesterday was amazing," Yui says with a smile. Ito can't remember anything, so Yui starts telling her about last night... Last night, she got drunk and lost her memory, but she was enthusiastically led into lesbian sex. The next morning, sober and with no memory, she resists, but is led into lesbian sex again. It's a two-stage lesbian sex that's too stimulating for a straight guy! As her sexual sensitivity develops, Ito's body gradually begins to crave lesbian pleasure of its own accord.