(Sister-in-law, are you doing well...?) Shunya used his summer vacation to visit Tokyo and stay at his brother's house. His secret admiration for his sister-in-law Yumi was briefly rekindled upon seeing her lively figure, but that joy was short-lived... He accidentally caught a glimpse of Yumi masturbating. Unable to hide his excitement at seeing Yumi in such a lewd state for the first time, Shunya's long-suppressed feelings of love for her resurfaced after her marriage. Acting on this impulse, he poured out his heart to Yumi...
