I have read up to chapter 38 of the Japanese original releases. The overpowered protagonist in this series is very assertive and decisive in everything, including romance. He is also the playful type, and together with a cast of adorable heroines, it makes the series very fun to read. There is also a lot of good ero-scenes. Think of this series with a protagonist that was originally a hero that returned to Earth, but was re-summoned back to the same fantasy world he was once a hero of, and he decides to do whatever he wants and adventure around. The highlight would definitely be the protagonist,he cares for his relationships with the heroines, and doesn't simply go around picking up girls. His character is very likeable and can be the sole reason for enjoying this series.