when i woke up in the morning… yui, my colleague in her underwear, is next to me!? yui smiles and says, "yesterday was amazing." yui begins to tell ito, who can't remember anything, about last night… last night, i was made to fall into lesbianism while drunk and with no memory, and the next morning, even though the alcohol had worn off and i was sober, i was made to fall into lesbianism again while resisting, it's too stimulating for someone who has never done it before! ito's body, which has been developed for sexual sensitivity, gradually begins to seek lesbian pleasure on her own.