My girlfriend accompanied me to a spinal massage clinic, deciding to undergo treatment with me because "having large breasts makes my shoulders stiff"... I heard moaning coming from the other side of the curtains... Aoi Hazuki MKON-115

The protagonist, Yusuke, has been experiencing shoulder stiffness lately. He tells Noah he's going to see a chiropractor, and Noah replies, "That sounds interesting, can I come along?" So Yusuke goes with him. The two enter the clinic, and Yusuke registers. However, the chiropractor says, "Your girlfriend's condition might be more serious," adding, "In many cases, women with large breasts develop serious illnesses without realizing it." So Noah also decides to receive treatment. From the other side of the curtains comes Noah's voice: "Oh!? Oh!?? Oh!??!" What kind of treatment is she receiving?!