The 48-year-old former Chief Business Officer at Google decided to call it a day as his 58-year-old boss Son said he was planning to quit at the age of 60 but felt he was "still a bit too young".
The development interestingly came just a day after Arora getting a clean-chit from a special committee set up by SoftBank to look into the allegations against him from some shareholders about his conduct and qualifications.
Arora, who has been instrumental in SoftBank's investments in Indian entities like Snapdeal, Ola, Grofers, Housing.Com and Oyo Rooms, said he intends to focus more on Indian start-up ecosystem going forward.
The exit of 48-year-old Arora, who was hand-picked by Son two years ago to succeed him and is among top-paid executives globally, also coincided with one of the most profitable deals of SoftBank.
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Arora will remain in an advisory role at SoftBank for a year, the company said in a statement.
"I was thinking of handing over my job as CEO when I turn 60, but thought maybe I'm still a bit too young, and still have energy to continue," Son said adding Arora whom he recruited two years ago will step down to pursue a different path.
Arora in a series of tweets said, "Masa 2 continue 2 be CEO for 5-10 years, respect that. Learnt a lot. Clean chit from board after through review. Time for me to move on."
"This will allow me to think about my next move," he said.
The Banaras Hindu University-graduate wouldn't be reappointed COO and President at tomorrow's shareholder general meeting.
Son, who founded SoftBank in 1981 and built it from a computer software distributor into one of Japan's largest telecommunications and investment holding corporations, said Arora's exit had nothing to do with shareholder criticism of his track record and qualifications.