As a member of the research party, I guessed the Atobe family background based on historical research.
That's right, it's Keigo Atobe's family business - Atobe Zaibatsu
Conclusion based on speculation:
1. The Atobe Zaibatsu was formed in the early 1950s, during the generation of Atobe Keigo's great-grandfather.
2. The Atobe Zaibatsu develops in a diversified manner with the financial industry as the center.
3. The Atobe family has fewer restrictions than big families like Mitsui
4. Keigo is an outstanding family heir who received a Westernized family education.
References:
①Teng Xinfeng. "Zaibatsu Governance in Japan" thesis for application for MBA degree
②Wang Wenying. "On the Formation and Characteristics of Japanese Chaebol Enterprise Groups" Journal of Suzhou University (Philosophy and Social Sciences Edition) 2008.03
③Chen Yan. "The Evolution of the Zaibatsu in Japanese Culture" China Science and Technology Information, Issue 1, 2006
④TV series "Iwamatsu Sees Japan"
⑤Animation "The Prince of Tennis"
⑥Original comic "The Prince of Tennis"
Intention: