No matter how many guys Iori ends up dating, none of them have been able to fully satisfy her in bed. Is anyone able to give her the pleasure she wants? ㅡ Iori's boyfriend is sweet and very handsome, but the sex just isn't that good.... That's why she has trouble maintaining romantic relationships. It's not like she's frigid or physically insensitive, either... After all, she has plenty of fun with her own vibrator. Cue: Her socially inept and hard-to-read little brother Aoi... comes to her looking for some advice. "I can't seem to get my girlfriend off during sex." "What should I do to please a girl?" thinking to play the role of big sis for once, she casually starts giving him advise, but...