"Mino Suzume x Kado Naho" - DAHLIA's proud collaboration of national treasure-level beauties! The four of us, who have been good friends since our university days, have now married and become two couples. Suzume, who married my best friend Atsushi, is incredibly beautiful, cheerful, and popular. Naho, who married me, a nerdy person, is modest and kind. So, the two of us decided to go on a hot spring trip together. At first, we were reminiscing, but the atmosphere gradually became strange, and I had a relationship with Suzume, and Naho had a relationship with Atsushi, and then...