Isekai-gaeri no Ossan wa Fusei Skill de Fathercon Musume-tachi wo Torotoro ni

The strongest Hero in history, Nakamoto Keisuke. He was summoned to another world in the spring at the age of fifteen years old, and when he successfully defeated the Demon King, he was already thirty-two years old. He had finished his role in another world and returned to Japan, but the reality that had been waiting for him was, "Middle school graduate with seventeen years of blank period" label. He couldn't find a decent job and had no choice but to spend his days working part-time. Before such a Nakamoto, a beautiful girl who self-proclaimed had come to return the favor, appeared. "I'm th