I went to Tokyo to take the entrance exam and went to my brother's house. When I went home, my brother was not there, and my sister-in-law 'Hikari' greeted me alone. - She is always bright and kind, and she is so beautiful that it is a waste for her big brother ... I've been secretly admiring him since the first time I met him. Apparently, my brother is on a business trip for a week, and I'm alone with my sister-in-law. - My sister-in-law's big are even more beautiful with a high degree of exposure, and I, a virgin, have become far from studying due to her defenseless appearance. And with my sister-in-law's words, "It's a rehearsal for when I have a girlfriend," I finally reached the limit of my patience ... Oral ejaculation, vaginal shot, facial cumshot ... A total of 7 shots. A 150-minute story written by Hikari, the princess of Munmun with a bewitching atmosphere.