Zuttomo Heart Beats! (ズッ友 Heart Beats! ; Always Friends Heart Beats!) is a B-side track included in Girls²'s 2nd Mini Album, Chuwapane! It's used as the 2nd ending theme of GO! GO! Atom (Go Astro Boy Go!), an animated spin-off of the Astro Boy franchise primarily aimed at younger children.
Muzukashii kao wo shite Nande mo nai nante waratte
No!-No!-No!-No!-No!-No! Hottokenai nda Nayami koto wa tsukinai kedo Guchi kurai wa kikasete hoshii
[Yuzu/Momo] Sukkiri shitara mata ganbarou
[Kira/Toa/Ran] Genki ga ichiban jan
Yaruki honki muteki
Tsuyoi kizuna ga chikara ni natte
Gutto gutto gutto guutto
Mune wo utsu kara
Yaruki honki muteki Nagai Jikan ga sugite mo Kitto Zutto Zutto Zutto
Zuutto tsunagatte iru kara
Heart Beats!
Joukigen koe dashite Nani ka ii koto demo atta?
Hey!-Hey!-Hey!-Hey!-Hey!-Hey! Ano ne! Kinou jitsu wa... Omedetai koto atta toki wa Best tsukushite yarikitta toki wa
[Yuzu/Momo] Gohoubi kurai atte mo ii desho
[Kira/Toa/Ran] Sore itsumo doori jan
Tsuyoki yuuki suteki
Hayai kodou ni mune takanatte
Gyutto gyutto gyutto gyuutto
Muchuu ni naru kara
Tsuyoki yuuki suteki Tooku Mieteta keshiki ga Motto Patto Patto Patto
Paatto irodzuiteku kara
Heart Beats!
My Best Friend
[Toa/Ran] Daisuki datte kimochi ga
[Momo/Kira] Arigato tte kimochi ga Kokochi ii rhythm ni natte
Hibiku
Yurari Fuwari Horori Yasashii Odayaka na kimochi ga Sutto Sutto Sutto suutto
[Toa/Ran] Tsutawatteku kara
Yaruki honki muteki
Tsuyoi kizuna ga chikara ni natte
Gutto gutto gutto guutto
Mune wo utsu kara
Yaruki honki muteki Nagai Jikan ga sugite mo Kitto Zutto Zutto Zutto
Zuutto tsunagatte iru kara
Heart Beats!
