日本語 Japanese Ask Questions Thread 8

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英語でも日本語でもOK
日本の方からのご協力も大歓迎です

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>>255
青春をこじらせる is an idiom which means "feelings/behavior specific to one's youth swell up".
In other words, 「One's "youth disease" gets worse」. "こじらせる" in here means its secondary meaning, "make a disease worse"
The phrase 青春をこじらせる reminds me of, for example, "write an own love song" or "a journey to rediscover myself" something like embarrassing.

In this context, the specific "青春をこじらせた" things are the 迪希's words to 恂 "Don't leave 佳城city." at her junior-high school age.   
    See 12:04 恂「迪希からさ、佳城から出て行ってほしくないってそんな感じのこと言われたよ。」

That sounds like a scene of a romance movie, so 融 has made fun of it.

"炸裂(burst)" indicates the fact 迪希 was unable to suppress her emotion and said such a romantic, "青春をこじらせた" phrase.

The two concepts/impressions 青春 and youth may be slightly different, however I'm not quite sure.
Anyway, hope this will help.