Daiary

Yesterday, I went to Satte cCity to see Cthe cherry blossoms.

That city is famous for theits beautiful flowers and great place to Ofor hanami.

So, my boyfriend tookdrove me there by car.

In the evening, I saw a musical in which my cousin playerformed.

Thate story, songs, costumes and set awere madecreated by thate college students.

But I think that quality is very high like, almost professional.

ThatIr was performed only yesterday, but it took one and a half years forto preparinge!

I feel that mottainaiit is a waste.

I am not sure, if this is the correct translation but I know that "mottainai" means being wasted.

Today, I worked at mythe office and met some new hires.

I don’t want to forget that first feeling.

Yesterday, I went to Satte city to see the Cherry blossoms.

That city is famous for theits beautiful flowers and a great place tofor Ohanami.

In the evening, I saw a musical whichthat my cousin playedis in.

Thate story, songs, costumes, and set are all made by that college studentstudents from that college, but I think the quality is very high, as if done by professionals.

But I think that quality is very high like professional.

Combined with previous sentence

Thatey performed it only yesterdayfor one night but it took one and half years ofor preparingation!

I feel that is such a waste, in other words "mottainai."

Today, I worked atfrom my office and met some new hires.

They awere so fresh and energetic!

I don’t want to forget that first feeling from when you're first starting out.

Yesterday, I went to Satte cCity to see Ccherry blossoms.

Generally "X City" is treating "City" as part of the name of the city, so it gets capitalised. If you were just using city as a descriptor, you could say "I went to the city of Satte", then it wouldn't be capitalised.

"cherry blossom" is a categorical noun and not a name of one thing, so doesn't get capitalised.

That city is famous for the beautiful flowers and being a great place to Ohanami.for flower viewing

花見 can be translated one of two ways to English. You can say hanami, as a noun, (and usually italicised, though LangCorrect doesn't support formatting) which focuses more on the customary nature of it along with the Japanese-ness, or just cherry blossom viewing or flower viewing which focuses on the practical activity involved. Most of the time, in translations intended for English speakers, they go with one of the latter two options, because most English speakers are not aware of the practice. The transliterated version is only used when you want to emphasise "They're doing this in Japan, as part of a Japanese thing"

However, even if you are using hanami as just a transliteration to emphasises the specific event, it sounds very strange to try to use it as a verb in English.

In the evening, I saw a musical in which my cousin played.

"play in a musical" = "perform an instrument as part of a musical"
"play a musical" = "start watching a recorded version of a musical, e.g. on youtube or a dvd"

Thate story, songs, costumes and set are made by that college students.

You wouldn't say "that college students", because (a) that is for singular entities (those is the plural equivalent), but also (b) you haven't yet introduced any specific set of college students. "that/those" are usually referring back to some already mentioned thing(s). Even though you've mentioned one college student, you can't use "those" as you haven't mentioned the group.

But I think that the quality is very high like professional.

Thatey performed only yesterday but it took one and a half years forto preparinge!

I feel that mottainai's too much.

もったいない is a hard one to translate between English and Japanese. Like a dictionary would tell you "wasteful" or "can't be helped", but I don't think either of them quite work here. Wasteful comes off more judgemental than もったいない does, and can't be helped isn't really right here as feels like it's unfortunate that it took so long to prepare. So I took a little bit of a liberty and said "too much" which comes off kind of like すぎる in Japanese, but I think is a more natural way to express this in English.

Today, I worked at mythe office and met some new hires.

Super small subtlety here: "My office" can sound like you own or run the office, while "the office" is more commonly used when just referring to the office you work at.

I don’t want to forget that first-time feeling.

Daiary

A 'Dairy' is where you milk cows.

Yesterday, I went to Satte city to see Cthe cherry blossoms.

That city is famous for the beautiful flowers and great place to Ohanamiview the blossoms.

People will not know what Ohanami is.

In the evening, I saw a musical in which my cousin played.

She is a music college studentstudent at a college.

Thate story, songs, costumes and set awere made by that college students.

I would use the definite article rather than the demonstrative. Would say 'were' as we are talking about the past.

But I think that the quality is very high like, almost professional.

Thatey performed only yesterday only but it took one and half years forto preparinge!

I feel that mottainaithe chance was too good to waste.

Thate city is famous for the beautiful flowers and great place to Ohanamisee them.

In the evening, I saw a musical in which my cousin playerformed.

Thate story, songs, costumes and set awere made by thate college students.

Because it happened yesterday, it is better to use the past tense.

But I think that the quality iwas very high likeand professional.

Thate performedance was only for yesterday but it took one and half years ofor preparingation!

It feel that mottainais like a waste of time.

Today, Iwhile I was workeding at my office and, I met some new hires.

They are so freshyouthful/refreshing (fresh) and energetic!

That city is famous for the beautiful flowers and great place to Ohanamiview the them.

In the evening, I saw a musical which my cousin played in.

That story, songs, costumes and set are all made by thate college students.

But I think thate quality is very high likeand very professional.

That performIt debuted only yesterday but it took one and half years ofor preparingation!

I feel that mottainaiwas a shame.