The Little Reincarnated Child Is Unmanageable! I Reincarnated as a Little Kid, but I'll Go "Kaboom!" With the Holy Beast!

Thanks to a god's intervention, Haru is reincarnated into another world as a two-year-old child. He's tiny and incredibly cute, but he's also very active, sometimes defeating huge monsters with a "boom!" and healing the heart of a spoiled young lady!