During his internment, Sengo developed a bleeding ulcer worrying about his wife and children. Fortunately, he happened to be living with another Japanese-Peruvian man who knew the art of shiatsu. This man offered to help Sengo with his ailment and after a few months he was completely healed. Amazed by his recovery, he asked this man if he would share his knowledge and teach him more about shiatsu. Through adversity, a seed of idea was now planted.

Sengo eventually reunited with his family and following the end of the WWII in 1945, they returned to the farm in Salinas, CA, only to find that the "friend" they had entrusted their farm to had sold it without their consent. No longer having a place to call home in the USA, the Shimizu family had no choice but to return back to Japan.

Returning home to his birthplace outside of Hiroshima, it was here that Sengo perfected his Sennin-so method of shiatsu. Utilizing what he had learned while interned, he first healed his elderly father who was literally bent over 90 degrees due to degenerative spinal stenosis. Townspeople, amazed at seeing his father walking around upright soon began to ask Sengo to heal their family members.

He was soon being asked to heal more people, which left little time to tend to the family farm. However, the townspeople much preferred that Sengo spend his time doing shiatsu rather than farming and volunteered their own time to tend to the Shimizu farm. All the while, he did not ask for a fee for the treatments. In return for his graciousness, people brought his family food and other necessities.

The countless numbers of people that came for treatments started referring to him as "Sennin." It was from this that the term "Sennin-so" came from which roughly translates in English to mean, "A place where a person with supernatural healing power lives." To this day, we still maintain this "Sennin-so" moniker in memory of my grandfather and his legacy.