The story sets in an Isekai medieval world after the mc dies of a heart attack and reincarnates into the son of a regional lord. Like most protagonist he is excited to use magic but becomes extremely distraught, distressed, and despaired once his family tells him they don't know what magic is. But because of the support of his sister, her friend Rose, and through a series of 'investigation' they were able to ignite his motivation, passion, and proof.. eventually proving that magic does exist and convincing his family to wholly support his endeavors...