Hakko Ryu is a school or 'style' of jujutsu related to Daito Ryu started by Okuyama Ryuho (1901-1987) a student of Sokaku Takeda and a practitioner of shiatsu. As such it places more emphasis on using pressure points than other aiki arts and is considered a 'hard' style of jujutsu.

It was studied by the founder of Shorinji Kempo.

External Links:

Hakko Denshin Ryu