Saikōsoku Fall in Love

"Saikōsoku Fall in Love" (最高速 Fall in Love, lit. "Highest Speed Fall in Love") is the first opening in the series sung by the voice actresses for Miia, Papi, Centorea, Suu, Mero, and Rachnera.

Renditions of the song also appear in each of the Character Album soundtracks, with the album's featured character singing the entirety of Saikōsoku Fall in Love solo.

Lyrics
English Lyrics 

Monster! Monster! Mon-mon-mon-mon Monster! Monster! Monster! Mon-mon-mon-mon Monster’s Life!

1: Stop worrying about whoever’s watching, And pick your target boldly, yet carefully! 2: Be careful with how you greet them; Once you’re prepared, proceed as normal! 3: Once you find an in, Take aim and FIRE, FIRE, FIRE, FIRE! 4: There’s no reason to hesitate; All that’s left is to take that heart down cleanly!

Ya only need a little bit of love – More importantly, more than anything, you gotta follow your desires, So c’mon!

Hey darling! If I have you here, could we get any stronger? If we could always be together, wouldn’t that be the best? No matter what may happen, If I’m with you, it’s all OK!

I can already tell, without a doubt, This has to be the greatest love in the whole universe! I can’t just keep waiting for an answer – I’m already gonna fall in love at max speed!

5: Offense is the best defense, So no time to rest – Just FIRE, FIRE, FIRE, FIRE! 6: Gotta say it all in an instant, So it’s essential we’re lookin’ in each others’ eyes!

Even in love… even in the throws of love, It’s not enough – gotta expose more of our instincts,

As we go along.

Hey darling! If I have you here, could we get any stronger? If we could feel things together, wouldn’t that be the best? Even if I have nothing else, I’m fine – it’s all OK!

It’s not a problem of where we were born; This very moment has to be the real meaning of love! Don’t stop my heart yet – that’s right, I’m at full speed!

Ahh, even if the world were to stop, The intense throbbing of my heart won’t end; I’m gonna go all out! X5

Hey darling… If I have you here, could we get any stronger? If we could always be together, wouldn’t that be the best? No matter what may happen, If I’m with you, it’s all OK!

I can already tell, without a doubt, This has to be the greatest love in the whole universe! I can’t just keep waiting for an answer – I’m already gonna fall in love at max speed!

It’s not a problem of where we were born; This very moment has to be the real meaning of love! Don’t stop my heart yet – that’s right, I’m gonna fall in love at max speed!

Trivia

 * The final scene in the opening song video is a reference to Son Goku's Spirit Bomb technique from the Dragon Ball franchise.
 * In each of their solo renditions of the song, Miia, Papi, Centorea, Suu, Meroune and Rachnera refer to "Darling" with the nickname they use to refer to Kimihito in the manga/anime. As such, Miia says "Darling", Papi says "Goshujin", Centorea says "Aruji-dono", Suu says "Master", Meroune says "Danna-sama" and Rachnera says "Honey".