Teigo IBA checked Takamaro's personality and invited Takamaro and his three elder brothers, Sanetsune TOKUDAIJI, Kinmochi SAIONJI and Michinori NAKANOIN to a restaurant near Sanno-jinja Shrine at Miyakezaka and explained the inside details of the Sumitomo family and requested that Takamaro join the family.
伊庭貞剛は、隆麿の人物を調査し、三宅坂山王神社付近の旗亭で、徳大寺実則、西園寺公望、中院通規の三兄と隆麿を招じ、住友家の内情を詳しく説明して入家を請うた。