Not a Top 10, but I really liked these videos for 2015:
MIAD-775, 2015-04-13, Hamasaki Mao / Mizuno Asahi
SNIS-517, 2015-10-07, RION (Utsunomiya Shion)
not as much a fan of the video, but really glad she returned
PPPD-407, 2015-10-19, Meguri (Fujiura Megu)
PPPD-408, 2015-10-19, Sayama Ai...