issyo ni taikinsimasu.

It is read:

いっしょ に たいきんします。

Without teaching spaces, it would normally be written as:

一緒に退勤します。

Japanese is usually written without spaces, so the spaced version is just for learners.

• 一緒 = いっしょ
• に = particle
• 退勤します = たいきんします

一緒に means together.

In this sentence, it describes how the action is done: the speaker and someone else leave work together.

A very common pattern is:

一緒に + verb

For example:

• 一緒に行きます = go together
• 一緒に食べます = eat together
• 一緒に退勤します = leave work together

The に makes 一緒 work adverbially, so it can modify the verb.

So:

• 一緒 = together / the same / company
• 一緒に = together, in a way that modifies the action

You can think of 一緒に as a fixed everyday expression meaning together.

退勤します is the polite form of 退勤する.

This is a suru-verb:

• 退勤 = a verbal noun meaning leaving work / clocking out
• する = to do

So:

• dictionary form: 退勤する
• polite form: 退勤します

This is very common in Japanese: many Sino-Japanese words become verbs with する.

します is the polite non-past form.

In Japanese, the non-past can mean:

• present/habitual: I leave work together
• future: I will leave work together

In a sentence like this, it often means a future action depending on context, such as We’ll leave work together.

Japanese usually relies on context rather than changing the verb form the way English does.

Japanese often omits the subject when it is clear from context.

So 一緒に退勤します。 could mean:

• I will leave work together
• We will leave work together
• He/She will leave work together

In real conversation, the listener usually already knows who is being talked about.

If you wanted to state it clearly, you could say something like:

• 私たちは一緒に退勤します。 = We will leave work together.

You often use と before the person:

田中さんと一緒に退勤します。
= I will leave work together with Tanaka.

Here:

• 田中さんと = with Tanaka
• 一緒に = together
• 退勤します = leave work / clock out

So と marks the companion, and 一緒に adds the idea of doing it together.

退勤します is correct, but it sounds workplace-related and somewhat formal.

It is used for things like:

• workplace speech
• schedules
• HR or company contexts
• talking about the end of a work shift

In casual conversation, people may more often say something like:

• 一緒に帰ります。 = We’ll go home together.
• 一緒に会社を出ます。 = We’ll leave the office together.

So 退勤します is not wrong at all; it just has a more specific on-duty / work-ending feel.

They overlap, but the focus is different.

• 退勤します = leave work / finish your work shift / clock out
• 帰ります = go home / return

So if you say:

一緒に退勤します。
the focus is on ending work together.

If you say:

一緒に帰ります。
the focus is on going home together.

Sometimes those happen at the same time, but they are not exactly the same idea.

No. 一緒 can also mean the same depending on context.

For example:

• 一緒です。 = It’s the same.
• 一緒に行きます。 = Go together.

So the exact meaning depends on how it is used. In 一緒に退勤します, it clearly means together, because it is followed by に and modifies a verb.