Tanaka Amaya, an ordinary high-school-girl leading a relatively normal life, finds herself unexpectedly entangled in a murder case. To ensure that the perpetrator is brought to justice, she must collaborate with a detective to solve the mystery by supplying him with any necessary assistance. However, she doesn't have a problem with it at all because the detective she's teamed up with is actually her crush who studies in the same high school as hers. How will she face the challenges that she would have to face in the future? And will she be able to help the detective in solving the case?