Classical Chinese medicine came to Japan when the two cultures started trading in the 6th Century AD. For centuries martial arts dominated esoteric practice : ju-jitsu techniques, striking vital points, were used to resuscitate martial arts students knocked unconscious. In the 17th Century a massage therapy called Anma evolved but it gradually fell behind herbal and medical techniques because, traditionally, its practitioners were blind.
In the early 20th Century Shiatsu Ho (finger pressure method) was published. This technique combined Anma, Ampuku (an ancient childbirth massage method), and Do-In (therapeutic exercises), with Western anatomy and physiology.
Westernised versions of Shiatsu became standardised in Japan but in the latter half of last century Tokujiro Namikoshi, Shizuto Masunaga and Katsusuke Serizawa developed more meridian-oriented versions and there are now many styles of Shiatsu.
I mostly use the tsubo oriented method of Serizawa because I can sense the tsubos with ease. I use a finger pressure, leaning-in, and Zen Shiatsu (intuition and connecting with client's chi) and Reiki interactions to good effect.
I sometimes (with good help) elicit a guided movement form which can effect emotional release, release inner conflicts and enhance awareness.
Otherwise I take few manipulative methods from Shiatsu. For skeletal or joint problems which I cannot resolve I usually recommend McTimony chiropractic or osteopathy practitioners who are also working with chi and meridian interaction.