Is Aki three years older than Denji?

The official Japanese character profile describes Aki as Denji’s 3年先輩, alongside his position at Public Safety. An English phrase such as “three years your senior” can sound like an age calculation. The Japanese word points us toward the workplace.

What does senpai mean?

A senpai is someone who came before you in a shared organization or activity. The corresponding newcomer is a kōhai. At school, the senior is often older too, which makes it easy to let the two ideas blur together.

At work, they can come apart. The Japan Foundation’s Irodori material gives this very distinction: a senpai can be younger than a kōhai. Joining earlier and being born earlier are separate facts.

What changes in our reading of Aki?

The useful question is what Aki already knows when Denji arrives. He is an established colleague; Denji is new to this organization. Reading senpai as a workplace relationship puts that difference in view.

I would keep it in mind when reading their early friction. Familiarity with an institution gives a person ways to judge a newcomer, even before the newcomer understands what is being judged. This is a reading of their position, not a rule that determines how every Japanese colleague behaves.

For an exact age, we would need different evidence. Adding three to Denji’s age turns a statement about seniority into a biography the phrase does not supply.