sono ken ha tantoubusyo ga tigau node, asita mata renrakusimasu.

件 means matter, case, issue, or topic.

In その件は, it refers to that matter or that issue.
This is a very common business-style expression in Japanese.

Examples:

• その件は後で話します。 = We’ll talk about that matter later.
• その件について確認します。 = I’ll check about that matter.

So その件 is a compact, natural way to say that issue / that matter.

Here, は marks その件 as the topic of the sentence.

So the sentence is structured like:

• As for that matter, ...

The speaker is introducing that issue as the thing being discussed, and then explains what is true about it:

• その件は担当部署が違うので、明日また連絡します。

If you used が instead, it would sound more like that matter is the specific subject being identified or contrasted in a different way. In this sentence, は is more natural because the speaker is talking about that matter as a topic.

担当部署 means the department in charge, the responsible department, or the relevant department.

It is made of:

• 担当 = being in charge of, responsibility
• 部署 = department, division

So together:

• 担当部署 = the department responsible for handling something

This is common in office and customer-service language.

In 担当部署が違う, the が marks 担当部署 as the subject of 違う.

Literally, this part is something like:

• the responsible department is different

This often implies:

• This matter belongs to a different department
• A different department handles this

So the structure is:

• その件は = as for that matter
• 担当部署が違う = the department in charge is different

This is a very natural Japanese way to explain that something should be handled elsewhere.

違う literally means to differ, to be different, or sometimes to be wrong depending on context.

Here it means:

• is different
• in other words, the department responsible for this is not this one

So the nuance is not just a general different, but specifically:

• This issue is handled by another department
• This is not under our department’s responsibility

In business Japanese, 担当部署が違う is a common soft way to say that the matter should be handled by someone else.

ので means because or since.

In this sentence:

• 担当部署が違うので、明日また連絡します。
• Because the responsible department is different, I’ll contact you again tomorrow.

Compared with から, ので often sounds:

• a little softer
• more explanatory
• more polite or less direct

That makes it especially common in customer service and workplace communication.

Both can mean because, but the nuance is a little different.

• から can sound more direct and subjective
• ので often sounds softer and more formal/explanatory

Compare:

• 担当部署が違うので、明日また連絡します。
• 担当部署が違うから、明日また連絡します。

Both are understandable, but ので fits better in polite business communication. It sounds more considerate and less blunt.

Yes, the subject is omitted, which is very common in Japanese.

連絡します means:

• (I) will contact (you)
• or depending on context, (we) will contact (you)

In this sentence, the omitted subject is most naturally:

• I or
• we / our side

The omitted object is also understood from context:

• you

So a full English-style version would be something like:

• Because a different department is responsible for that matter, I’ll contact you again tomorrow.

Japanese often leaves out subjects and objects when they are obvious.

また here means again.

So:

• 明日また連絡します = I’ll contact you again tomorrow

It suggests there was already some contact now or earlier, and the speaker plans to contact the person once more tomorrow.

Be careful: また can also mean also in some contexts, but here again is the natural meaning.

In natural English, it means:

• I’ll contact you again tomorrow

The Japanese word order is:

• 明日 = tomorrow
• また = again
• 連絡します = will contact

Japanese often places time expressions early in the sentence, so 明日また連絡します is very normal.

The meaning is:

• the contact will happen tomorrow
• and it will be another contact

The comma marks a pause between:

1. the reason/explanation
2. the main action

So:

• 担当部署が違うので、
• 明日また連絡します。

This is similar to English:

• Because the responsible department is different, I’ll contact you again tomorrow.

Japanese commas are somewhat flexible, but this comma makes the sentence easier to read and sounds natural.

その means that, usually something close to the listener or something already mentioned in the conversation.

So その件 means:

• that matter
• that issue we’ve been talking about

This is different from:

• この件 = this matter
• あの件 = that matter over there / that matter we both know about

In conversation, その件 is often used when responding to something the other person just brought up.

Yes, it is polite.

The politeness comes mainly from:

• 連絡します (polite -ます form)
• ので, which sounds softer than から
• the overall business-like wording such as その件 and 担当部署

This is the kind of sentence you could hear in:

• an office
• customer support
• formal phone calls
• email-style spoken Japanese

It is polite, though not extremely honorific. It is standard professional Japanese.

Yes. Japanese often leaves important details implied.

This sentence suggests something like:

• I can’t fully handle this right now
• another department is responsible
• I will check with them or arrange things
• I will get back to you tomorrow

None of that is spelled out directly, but it is understood from:

• 担当部署が違う
• 明日また連絡します

This indirectness is very common in polite Japanese communication. It sounds smoother and less blunt than saying something like This is not my department.