After getting married and moving into my husband's house, I started living with Mitsuki, his middle school-aged sister. However, sometimes Mitsuki's glances at me bothered me. And then there was the unexpected kiss in the morning. I thought it was just a mischievous girl playing around, but before we got married, she told me that from when she was dating my husband, she had hoped for a sister like me to come to our house...
