ヒドラ ("Hydra") is an extension of ハイドラ (also written as "Hydra"). tvhc_tvhc Jari Gerritsen remus TdG. The ascents from both climbs are listed on this page.
From Dai Koyamada's blog: http://koyamada.dai.hiho.jp/?eid=468579
Here are photos of “ヒドラ” (5th dan / V14–15), which I made the first ascent of yesterday in Shiobara.
This problem starts about three meters to the left of "ハイドラ" (V13/14), beginning from a left-hand two-finger pocket and a right-hand mono pocket. After completing four very hard moves, it links into "ハイドラ"."