Yarinaoshi Reijô wa Ryûtei Heika o Kôryaku-chû

This show is based on a light novel and manga, and it stays pretty true to them. It's a fun, light-hearted romance, but the age difference of the protagonists can be very off-putting. It's a little better in the manga and light novels since there they hint at the older character being able to see her as her true older self. However, the age difference is the real problem with this. The characters also seem a little overpowered with no one blinking an eye at it. Other than these two things, though, it's a good, fun anime. If you can get past the age-difference, it's well worth the watch, especially if you like the reincarnated trope.