raisyuu tomodati ga watasi no mati ni hanabi wo mi ni kimasu.

Because 来週 is a time expression, and many common time words in Japanese do not need a particle.

• 来週 = next week
• 今日 = today
• 明日 = tomorrow
• 去年 = last year

So:

• 来週、友達が来ます。 = My friend is coming next week.

Using に after 来週 is usually unnatural here.

が marks 友達 as the subject of the sentence.

• 友達が来ます = A/The friend is coming.

This sounds like a neutral statement about who is coming.

If you used は instead:

• 友達は来ます

it would sound more like As for my friend, he/she is coming or it could create a contrast, depending on context.

So が is very natural when simply stating the event.

Not literally by itself. 友達 just means friend.

However, Japanese often leaves out words like my, your, or his/her when they are obvious from context. In English, we usually have to choose, so the translation may say my friend.

So in this sentence, 友達 could be understood as:

• my friend
• a friend
• my friends / some friends

depending on context.

Yes. 友達 can mean either friend or friends.

Japanese nouns usually do not change form for singular vs. plural the way English nouns do. Context tells you which meaning is intended.

So this sentence could mean:

• A friend is coming to my town next week to watch fireworks.
• Friends are coming to my town next week to watch fireworks.

If there is no extra context, many learners will read it as singular, but grammatically it could be either.

私の町 means my town.

• 私 = I / me
• の = a particle showing possession or connection
• 町 = town

So 私の町 literally means the town of me, which in natural English becomes my town.

The particle の is very common for linking nouns:

• 私の本 = my book
• 日本の文化 = Japanese culture
• 学校の先生 = school teacher

Here, に marks the destination of movement.

• 町に来ます = come to the town

Since 来ます is a movement verb, に shows where the person is coming to.

You may also see へ with movement, but に is very common and slightly more specific as a destination marker.

So:

• 私の町に来ます = come to my town

Because 花火 is the thing being watched, and を marks the direct object of 見る.

• 花火を見る = watch fireworks

In this sentence, that whole idea gets built into a larger structure:

• 花火を見に来ます = come to watch fireworks

So を is there because fireworks are what the friend is going to see.

This is a very common Japanese pattern:

verb stem + に + 行く / 来る

It means go/come in order to do something.

For 見る:

• dictionary form: 見る
• stem: 見

So:

• 見に行きます = go to see
• 見に来ます = come to see

That is why you use 見に来ます, not 見るに来ます.

This same pattern works with many verbs:

• 食べに行きます = go to eat
• 会いに来ます = come to meet
• 勉強しに行きます = go to study

Japanese chooses come vs. go based on the speaker’s point of view, just like English often does.

Because the destination is 私の町 (my town), the movement is toward the speaker’s side, so 来ます is natural.

• 来ます = come
• 行きます = go

So:

• 私の町に来ます = come to my town

If the speaker were talking about a different place not connected to them, 行きます might be more natural.

Japanese polite non-past forms like 来ます can refer to:

• the present/habitual
• the future

The time word 来週 makes it clear that this sentence is about the future.

So:

• 来ます by itself = comes / will come
• 来週来ます = will come next week

Japanese often relies on time expressions to show when something happens.

In a sentence like this, 花火を見る usually means watch fireworks or watch a fireworks display.

So it often implies an event such as a summer festival or fireworks show, not just looking at a single firework object.

That is why the sentence sounds natural as:

• come to my town to watch fireworks

rather than something like come look at fireworks as objects.

No. Japanese is normally written without spaces between words.

A natural written version would be:

来週、友達が私の町に花火を見に来ます。

The spaces in your sentence are probably there only to help learners see the word boundaries.

You may also notice the comma after 来週. It is optional, but it often makes the sentence easier to read.