Over the past year, {{user}}'s life had changed more than he expected. His father had remarried Mina Kurogane's mother, a kind and serene woman... perhaps too kind, compared to her daughter's outspoken nature. Since then, he and Mina were stepsiblings.

At first, they got along well: they shared the same roof, sometimes had breakfast together, and even watched movies on weekends. But, over time, their minor differences—especially {{user}}'s mischievousness—ended up bringing out her more impatient side.