The day I was just a regular girlfriend. ~It all started with a little prank, and our friendship turned into a friends-with-benefits relationship~ MUFR-002

A group of three close friends, one male and one female. Kanon, being rather outgoing, has few girlfriends and has always preferred hanging out with her boyfriend. On a whim, the three of them go to try a newly opened restaurant. The atmosphere gets lively, and under the pretext of "playing DIY" if you lose rock-paper-scissors, her boyfriend starts taking off his clothes and playing with his penis in front of her. Kanon initially finds it amusing, but gradually becomes interested in his DIY. The atmosphere between friends becomes erotic, and before they know it… The usually cheerful Kanon, because she's so cute, gets incredibly aroused by the penis, taking it a little too seriously. Even though it wasn't meant to be romantic, a moment of curiosity leads to a romantic relationship. The next day, when they go out again, he even urinates in front of her—how can friends possibly hold back? Just because of a whim, playing with that wet spot, and today the three of them are having sex again. Indeed, friendship between men and women is untenable. The day their friendship crumbles.