| Name | Alternative/Original Name | Notes | Artist | Availability |
|---|---|---|---|---|
| Kaidoku Funou | Code Geass OP2 | Jinn | KY TJ | |
| Kakumei DUALISM | 革命デュアリズム | Valvrave 2nd Season OP | T.M.Revolution x Nana Mizuki | KY |
| Kanade | 奏（かなで） | Rough OST, covered by Sora Amamiya for One Week Friends ED | Sukima Switch | KY |
| Kanashimi wo Yasashisa ni | 悲しみをやさしさに | Naruto OP3 | little by little | KY |
| Kasumi Yuku Sora Se ni Shite | 霞ゆく空背にして | Asobotto Senki Goku ED 2 | Janne Da Arc | KY TJ |
| Kesenai Tsumi | 消せない罪 | Fullmetal Alchemist ED1 | Nana Kitade | KY TJ |
| Kimi ga Inai Mirai | 君がいない未来 | Inuyasha Kanketsu-Hen OP | Do As Infinity | KY TJ |
| Kimi ga Suki da to Sakebitai | 君が好きだと叫びたい | Slam Dunk OP | BAAD | KY TJ |
| Kimi no Gin no Niwa | 君の銀の庭 | Puella Magi Madoka Magica Movie ED | Kalafina | KY |
| Kimi no Shiranai Monogatari | 君の知らない物語 | Bakemonogatari ED | supercell | KY TJ |
| Kinjirareta Asobi | 禁じられた遊び | Rozen Maiden OP | ALI PROJECT | KY TJ |
| Kiseki no Umi | 奇跡の海 | Record of Lodoss War: Eiyuu Kishiden OP | Maaya Sakamoto | KY TJ |
| KOIBUMI | Asagiri no Miko ED1 | Megumi Hayashibara | KY TJ | |
| Kokoro E | 心絵 | Major S1 & S6 OP | ROAD OF MAJOR | KY |
| Komm, susser Tod | Komm, süsser Tod〜甘き死よ、来たれ, Come Sweet Death | The End of Evangelion OST | ARIANNE | KY |
| Kouga Ninpouchou | 甲賀忍法帖 | Basilisk OP | Onmyouza | KY TJ |
| Kuroi Namida | 黒い涙 | Nana ED3 | Anna Tsuchiya | KY |
| Kuusou RUMBA | 空想ルンバ | (Zoku & Goku) Sayonara, Zetsubou-Sensei OP | Kenji Ohtsuki | KY TJ |
| Kyoumu Densen | 凶夢伝染 | Another OP | ALI PROJECT | KY |
| Lacrimosa | Kuroshitsuji ED2 | Kalafina | KY TJ | |
| LAST IMPRESSION | Gundam Wing Endless Waltz Movie OST | TWO-MIX | TJ | |
| Let Me Hear | Parasyte OP | Fear, and Loathing in Las Vegas | KY | |
| Lie-Lie-Lie | Naruto Shippuden Movie OST | DJ OZMA | KY | |
| LIFE | Bleach ED5 | YUI | KY TJ | |
| Life is Like a Boat | Bleach ED1 | Rie Fu | KY TJ |