1. Hierarchical relationships
上下関係
Japanese companies still have the concept of hierarchical relationships. At the company the relationship becomes a little more complicated. People who join the company first are seniors. As a general rule, treat people who are seniors with respect.

2. Words
ことば
Use honorifics (like “kacho” or “shacho”) and politeness (like “desu” or “masu”) to your superiors. By this, you can show your position and respect to people. Also, don't interrupt when the other person is talking. First of all, it is important to listen carefully and after that you can give your opinion.

3. Attitude
態度
Don't forget to put the other person first. For example:
1)when taking an elevator or entering a room;
2)when thinking about seating order (further or closer to the door);
3)when handing over documents, etc., hand them with both hands while facing the other person.
Do this to anyone, not just your superiors or seniors.

4. Superiors
先輩
At the drinking party, you can hear a lot of private stories that you cannot hear at work. But when you go to work the next day, be careful not to talk or behave in a friendly manner. At the party after work it is common to forget about hierarchy and have fun, but at the workplace we should use appropriate language and behavior.

5. Paying for meals
支払い
In some countries, when you go out to eat with someone older than you, the older person always pays for the meal. But not in Japan. Of course, they may treat you to a meal, but it's not always, so be ready. Also, don't forget to thank them later!

6. Thinking about Hierarchical Relationships
考え方
There is also the idea that hierarchical relationships make it difficult for subordinates to express their opinions and reduce work efficiency. For this reason, there are companies that call everyone by “Tanaka-san” rather than “Manager Tanaka''. If the company has decided to stop using honorifics, you still need to speak politely and say "desu" and "masu". Even if the hierarchical relationships are eliminated, we should value and respect the people we work with.