Ichika, a younger sister whose parents remarried when she was little, longs for me and misses me. Ichika has a friendly personality and is close to my friends, and I think she often smiles, but I never thought she was playing mischievous games that I didn't know about! My cute little sister! However, they got back together because it’s nice that my sister is indifferent to sex! 'Do it with my brother,' my sister called to me, and something about my feelings changed...