Pleasant
The soul of a person has a hook that can make them pleasant. When you see, hear, or feel something pleasant, can't you feel that hook pressing into the middle of your body?
かい
こころよ
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If you want to feel this pleasant feeling just look at a kayak (かい). Kayaks are the most pleasant boats in the world. Feel that pleasant feeling in your chest just from reading about kayaks in this mnemonic right now.