Rough grammar. I omitted smaller errors like lack of commas as it happened multiple times, and some words are clearly untranslated ("nee" and "are?", to list a couple)

p3:

You chan is energetic, get along with everyone, and really popular>gets along/and is really popular

from the girl I admire>of the girl I admire

p5:

After we graduate from high school, me and You chan went to Tokyo, and go to the same university>After we graduated from high school, You-chan and I went to Tokyo, and went to the same university

At first, during our high school time, I used to treat her as friend but...>At first, during our high school years, I used to treat her as a friend, but...

p6:

Was the drinking party, that fun?>Was the drinking party that fun?

turned into a weird couples>turned into a weird couple

p9:

You smelled like alcohol>You smell like alcohol

p10:

more over>moreover (not sure if it's just missing a hyphen)

p17:

it's always me the onethat enjoy it...>it's always me who enjoys it...

p22:

Our face is all soaked>Our faces are all soaked

p23:

Our lewd places... Is kissing...>Our lewd places... Are kissing

p26:

Riko chan didn't I always said that I'm not confidence in my self>Riko-chan, didn't I always say that I'm not confident with myself?

Base +13, osmar1 +16, sagitbob8 +6, cybeast93 +21, Frygon +10, OnceForAll +38, wikishonen +6, andystevens1997 +9, rawrtor +11, Lord Cristofer -5

tagging rough grammar based on reaku's comment

Base +15, rawrtor +11