I applied through an employee referral. The process took 2 weeks. I interviewed at Robert Walters (Tokyo) in Dec 2017
Interview
You'll be asked to speak with no fewer than 6 managers and no more than 10 (from what I've been told, I had just 6). Assuming all goes well, they'll ask you which manager you felt you connected with best out of a selected list, and then that will likely be the team to which you're assigned.
I met with 6 people in total, the interviews were fine but it lasted for more than 1.5 months. They asked all the questions that other people were mentioning here.
1) phone interview/screening: general questions based on resume
2) manager interview: get to meet each team's manager and get to know about the teams
3) country manager interview: mock-trial for headhunting
Interview questions [1]
Question 1
self-introduction, what interested you to become a headhunter, etc..
Had met several consultants from several teams. Also at the end we went quick drink with few consultants and it was the final interview. Until then it is the process of the interview so be careful.