for a girl it would be: Atashi/watashi no kokoro: anrokku! for a boy it would be: bouku/oreno no kokoro:anrokku!
heart is kokoro
my heart
私の心の中is the way to say 'in my heart' in the Japanese language. hope i have helped! :)
kuroikokoro
kuraikokoro
meinu
Mikazuki no kokoro
You may say 'kokoro kara,' which literally (and conveniently) means "from the heart."
心魂 Shinkon
Japanese word "mune" is literally "chest". In context, though, it may mean "heart" in an emotional expression, such as in English we say "heavy heart" or "my heart leaped"
Heart is Kokoro こころ