廃部の危機とグルーヴ杯 / A Club in Crisis and the Groove Cup
えっと……内緒にしてたってことっすか？
Um... So you've been keeping this a secret from me?
うん、だってカケルくん優しいから。
That's right. It's because you're super kind!
？？
Hm?
How the Japanese doesn’t use ”!” for Canon here is better, as it shows she is transitioning to serious talk contrary to her usual antics. Translated bluntly, it’d be “Un. It’s because Kakeru-kun is so kind.” When someone like Canon say it like this, it is sure to make the listeners notice the shift in tone.
Kakeru’s ”??” is also better than how English text did it in my opinion.
春大会の日、怪我で出場できないわたしの代わりに
いきなり試合に出てくれたでしょ。すっごく優しい。
On the day of the Spring Tournament, you jumped in to compete in my place when I got injured. That was incredibly kind of you.
廃部のこと教えちゃうと、自分のためじゃなく、わたしたちのために
グルーヴコースター部に入るって言うんじゃないかなって。
We were worried that if we spilled the beans about the disbandment, you'd join for our sake rather than deciding for yourself.
The follow-up sentence matches in seriousness.
ここのところずっと成績も悪くて。
校長に言われちゃったんだよね「このままだと廃部だー！！」って。
Not to mention that our results have been awfully lacking in recent times. The school principal warned me that if things don't improve then the Groove Coaster Club will be disbanded.
The Japanese version has the direct quote from the principal: “If things keep going like this the club is disbandedー!“.
ああ。リーグ戦のナナイロック地方大会が８月～９月。
そして全国大会が秋から冬にかけて行われる大会だ。
That's right. You have the Prismarock Regional Tournament, which uses a round-robin format, taking place in August and September. Then the National Tournament runs from autumn until winter.
Japanese used “League Battle” (リーグ戦 / league-sen) for the round-robin format. Actually, I didn’t know about this before comparing!
同地域の南にある虎鼓夏高校の３年レギュラーは、
創立至上、最高のメンバーが集まっていると言われている。
The third-year Groovers who attend Kokonatsu High School in the south are said to be the strongest Groover lineup to emerge since the school's founding.
Again with the frequent “Groover” usage in English, where there’s none in Japanese. In Japanese, “regular” レギュラー is used for those getting on stage and not just club members. It will be used more in Aria’s arc, where there’s a story about becoming a “regular”. It also uses “member” メンバー instead of Groover in the 2nd sentence.