A wolverine's heart is in prison, so you need to hurry to set it free. If you don't hurry, its heart won't survive. And the wolverine's death will be on you.
You're trying to hurry as fast as you can to save the wolverine. But you're losing strength, so you grab a cucumber (きゅう) from your bag and munch on it to get some of your hurrying power back.
Currently there are no similar looking kanji which exist in the WaniKani learning system