I usually go to Partir esthetic at least once in a week. It's located in a convenient place near the station and the staffs are all friendly! partir esthetic in Shinjyuku East store
4F Shinjyuku Ryuseido building, Shinjyuku3-21-6, Shinjyuku-ku, Tokyo-to
03-5357-7433
http://www.partir-cb.com/shopInfo-s-east.php