No, it's not Makoto Kino. She could've fooled the untrained eye but of course, fans of the Sailormoon series would know that the girl pictured on the left is not our dear Mako-chan.

Her name is Rui Saoinji. She appeared in Sailormoon episode 14. No, she is not Mako's sister. Actually, Rui and Mako aren't even related.

Rui is an avid tennis player. She is on the tennis team and she is always practicing. Rui is Naru Osaka's close childhood friend. She is like a big sister to Naru. Naru and Usagi would watch Rui play at times.

Rui was possessed by Nephrite because he had sensed that she had a very high level of energy. Sailormoon, being the only sailor soldier that had been discovered then, saved Rui.