Echo Again, by Splay, is the third ending to Katekyo Hitman Reborn!, and is used from episodes 30-38.
Takai biru no aida no tsuki ga Kurai heya no mado ni ukandenda Tooi kimi kada todoita tegami wo Sotto koe ni da shite mitanda
Tabidatsu boku wa miokutta kimi ga Mabuta no ura ni nijin de wa kieru Aita yoru wo koete motto Fureteitai kimi ni motto Boku no naka no yami wa itsudatte
Kimi jyanakya kienakute Tsutaerareru koto wa kitto Arifureteru ai no kotoba dake I DON'T WANT TO MISS YOU ANYMORE
Itoshiku omo hodo ECHO AGAIN
The moon shines through my window from between the tall skyscrapers I tried reciting aloud the letter you sent me from so far away,
When I close my eyes, I can see you for an instant as you say goodbye Enduring the nights, I long to see you more. Wanting to touch you more...
You're the only one who can erase the darkness inside me All I can tell you, I'm sure I DON'T WANT TO MISS YOU ANYMORE
The more I long for you, the more it ECHO(es} AGAIN
- This ending was only used for 9 episodes, shorter than the usual 13-26 for most anime endings.