Based on an isekai light novel series written by Sumimori Sai and illustrated by Takahashi Ai.
Hart's life is nothing but a complications of misunderstandings. Primarily and most humourous is that his adopted father was giving what should have been an inspiration speech, but due to the fact Hart isn't vocal about he laziness (ironically), both of them completely miss the mark. Hart is trying to groom his foster sister as the next queen and their father thinks Hart is inspired to be king.