Without any prior consultation, my father abruptly announced his remarriage. As a result, 'Kousuke' suddenly found himself living with his stepsisters. The sisters had a very good relationship but were polar opposites in personality. One was 'Kana,' who claimed to be 'big sister' even though she was younger than 'Kousuke,' and was bright and mature. The other was 'Sayo,' who hated men and would only show a grumpy face to 'Kousuke,' often isolating herself. Despite my confusion over the sudden situation, my father moved to a new house with his new wife just a month after we started living together. Consequently, 'Kousuke' became responsible for taking care of the two. Fortunately, the sisters seemed to get along well, so 'Kousuke' decided to manage the finances and household chores with the money sent to him. He resolved to live peacefully like this. Then, a few weeks later, one morning... I found myself waking up in the same bed as one of my stepsisters, 'Kana.'
