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Translation

• Context: Harima Kenji 播磨拳児 is full of regret.
• chikushou......!!
  ちくしょう･･････！！
  [Damn it]......!!
• {{{suki na} ko to umi ni ikeru} chansu da} tte no ni yo!!
  好きな娘（こ）と海に行けるチャンスだってのによ！！
  Even though {[it]'s chance [for] {[me] to be able to go to the beach with the girl [that] {[I] like}}}!!
  • da tte no ni - contraction of da to iu no ni だというのに.
  • umi
    海
    The sea. (literally.)
    The beach. (where you go in English.)