“No, this isn’t hazing. I’m telling you, this is because I’m your senpai. Kouhai runs, senpai on bicycle”
Senpai is the Japanese term for senior. Kouhai is junior. Senpai-kouhai relationship in Japan is very strong. Once you are a senpai/kouhai, you are bounded to that status forever.
The status is not based on age. It is based on when you entered the institution, e.g. school or a workplace.
The senior will gain respect. The junior will gain guidance.
And, of course, every kouhai will get another kouhai… but seldom senpai gets another senpai :D
*Shinjuku, Tokyo, Japan