Tobira (Gon & Killua) is a song sung by Junko Takeuchi as Gon and Kanako Mitsuhashi as Killua.
Lyrics
Gon: Tatake me no mae no tobira[1]
Ima sugu ni hikaru kobushi tsuyoku
Killua: Kowase me no mae no tobira
Ima sugu ni mayou himanado nai
Gon: Kinou made wa miageteita akogare no sekai
Killua: Watashi no mama tobikomerusa ima koso no rikomou
Both: Kirameku ashita ni dea eru hazu dayo
Both: Moshi mo afuredasu omoi kanjitara
Hiraku tobira ga yuuki
Gon: Hibike hashiri dasu kodou itsu datte
Yume wa akira menai
Killua: Susume mukidashi no keshiki tsukamereba
Sugoi HINTO ni naru
Gon: Suna no shamen kake agareba
Atarashii sekai
Killua: Kaze no RIZUMU mikatanishite
Tachi machi mugen dai
Both: Ryoute de uchuu wo
Tsukan ja uka mo ne
Both: Sousa hajimari wa kimi no mae ni aru
Hiraku tobira ga yuuki
Gon: Nuri kaeteku hikari no chizu
Hateshinai sekai
Killua: KATACHI no nai toki no nakade
Both: Kagayaki hajimeteru
RIARU na jibun ga aru ki dashiteiku
Both: Sousa hajimari wa kimi no mae ni aru
Hiraku tobira ga yuuki
Kimi no mirai!
Gon: Fight, the door before my eyes[2]
Right now I'll strengthen my glowing fists
Killua: Break, the door before my eyes
Right now I don't have the time to wander
Gon: Until yesterday I was admiring the world I wanted
Killua: I was wandering as myself, but now I'll get on board
Both: I'm sure we'll meet in a glittering tomorrow
Both: If we feel the overflowing memories
The door that opens is courage
Gon: Resounding, the racing heartbeat will never
Give up on dreams
Killua: Encouragement, if you catch hold of the naked landscape
It'll be a great hint
Gon: If you run up the sandy slope
A new world
Killua: The rhythm of the wind will be on your side
All at once, infinity
Both: Give it all your effort and the universe will
Burst from the grave and fly
Both: That's right, the beginning is when
The door that opens before your eyes is courage
Gon: The map repainted with light
An endless world
Killua: In the middle of a formless time
My real self will keep walking on
Both: That's right, the beginning is when
The door that opens before your eyes is courage
Your future!