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| Kokoro no Mondai / Onegai Prime Minister
| Single by toutou
Problem Of the Heart (ココロの問題 Kokoro no Mondai) is a single by toutou. The title song is the fifth ending song of the anime Keroro Gunso from episode 79 to 103.
- Toutou the singers of this song appeared in their Keronian forms in the poster.