DASD-383 Asahi Mizuno, the world’s most beloved sister, decides to marry her unpleasant boyfriend one day

Chaoyang, my sister-in-law, was working hard to grow her younger brother Yuuki into a good member of society, but recently Iwata, the first boyfriend in her life, was born. The appearance is ugly and unpleasant, but he was a nice person for Chaoyang. But, like his appearance, his personality was distorted. Chaoyang cut off his younger brother for false happiness.