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| Key | Song | Notes | Artist |
|---|---|---|---|
| 41196 | Koko dewa nai, Dokoka e (ここではない、どこかへ) | Perfect Love OST | GLAY |
| 42334 | Kokoro E (心絵) | Major S1 & S6 OP | ROAD OF MAJOR |
| 43826 | Kokoro no Placard (心のプラカード) | AKB48 | |
| 60882 | Komm, susser Tod (Komm, süsser Tod〜甘き死よ、来たれ, Come Sweet Death) | The End of Evangelion OST | ARIANNE |
| 42263 | Kono Yo no Kagiri (この世の限り) | Sakuran OST | Sheena Ringo × Saito Neko + Shiina Junpei |
| 41912 | Kono Yo no Shirushi (コノヨノシル) | BoA | |
| 41760 | Kotoba Yori Taisetsu na Mono (言葉より大切なもの) | Stand Up!! OST | Arashi |
| 41441 | Koucha (紅茶) | Maaya Sakamoto | |
| 42193 | Koufukuron (幸福論) | Ringo Sheena | |
| 42279 | Kouga Ninpouchou (甲賀忍法帖) | Basilisk OP | Onmyouza |
| 41224 | Kuchibiru (口唇) | GLAY | |
| 41119 | Kuchibue (口笛) | Mr. Children | |
| 41562 | Kuki (STEM) (茎（STEM）) | Ringo Sheena | |
| 41161 | Kurenai (紅) | X Japan | |
| 42264 | Kuroi Namida (黒い涙) | Nana ED3 | Anna Tsuchiya |
| 41705 | Kurumi (くるみ) | Koufuku na Shokutaku OST | Mr. Children |
| 42696 | Kuusou RUMBA (空想ルンバ) | (Zoku & Goku) Sayonara, Zetsubou-Sensei OP | Kenji Ohtsuki |
| 43464 | Kyoumu Densen (凶夢伝染) | Another OP | ALI PROJECT |