The first meeting of Shihan Adnan Tarsha with Sosai Oyama in Japan was in 1982, when he traveled to train with Sosai Oyama for a month. Sosai welcomed him very well by a special Karate demonstration on his honor in the head quarter in Tokyo. Sosai invited him to accompany him in several visits, Also Sosai invited him several times for lunch and dinner in different restaurants.

In the same period Sosai Oyama invited him to a theatre to watch the play of the famous Japanese actors, one of them is his student Sunny Shiba, who played the roll of Oyama in a movie film, also the actor Sanada Masahiro and others. After the play there was a meeting with those actors.

When the training period with Sosai Oyama is finished, Sosai arranged for him a valediction party and invited to it the Japanese instructors and students, and presented to him some gifts.

After two years they met in the third world tournament in Tokyo in 20-22/1/1984. Sosai Oyama sent an invitation to him to attend this tournament as a special guest. In the concluding day he has been called to go on the ring and then Sosai Oyama presented to him a plate on this occasion. After the tournament they met in the international meeting for the branches chiefs in the world. Then they met in the valediction party.

After four years they met in the fourth world tournament in Tokyo in 6-8/11/1987. He was a special guest according to an invitation from Sosai Oyama. Then they met in the international meeting for the branches chiefs in the world. Also they met in the valediction party.

The corresponding continued between both of them. In the year 1991 he received a letter from Sosai Oyama informing him that he is a candidate to be the Middle East Chairman.

In the year 1991 he received as usual a special invitation from Sosai Oyama to attend the Fifth world tournament in Tokyo, but he couldn't make it because some circumstances, and before the date of the sixth world tournament in 1995 which he attended it, Sosai Oyama was dead in April, 1994.