[NTR Hot Springs] A special project fulfilling the fantasy of seducing a girlfriend from a couple heading to an inn, by approaching her under the guise of a hot springs TV program. This time's target is "Saya," a charming girl with luscious black hair and a petite frame. While on a hot spring trip with her boyfriend, she convinces him to stay in the room alone as she heads to the baths, claiming she'll take a long time. Suddenly, a surprise offer to participate in filming is made, and with her boyfriend's permission, she agrees to take part. Unaware she's being filmed in the changing room, she changes wearing only a bath towel. Directed by Tei, a seducer is introduced, and though she worries her boyfriend might get upset over the man's frequent physical contact, she continues with the shoot. After filming ends, the seducer invites her to a mixed-gender bath, where an erotic atmosphere quickly builds in their private setting. She fills the bathhouse with lewd moans during foreplay, fingering, and cunnilingus, eventually giving a blowjob to the stranger's cock—bigger than her boyfriend's. Despite guilt toward her boyfriend, she's charmed by the well-endowed man and follows him not to her own room, but to his. Whether due to sensitivity or his skill, she repeatedly reaches orgasm with a man other than her boyfriend. Climaxing repeatedly from face-sitting and cunnilingus, she then takes the seducer's huge cock deep inside her pussy, convulsing orgasm after orgasm. In the end, she's facialized with the stranger's cum and performs cleanup fellatio. Under the verbal domination of this dominant man, she repeatedly apologizes aloud—"Sorry, ○○ (boyfriend's name)"—while her body betrays her with continuous, convulsive orgasms. Her descent into pleasure is the ultimate highlight!