Kakushinteki Metamorufo-se!

Kakushinteki Metamorufo-se! (also written as Kakushinteki☆Metamaruphose! or Kakushin-teki Metamarufōze) is the opening theme tune to the ''Himouto! Umaru-chan'' Himouto! Umaru-chan (Anime) series. It is performed by Aimi Tanaka, the voice actress of the infamous Umaru Doma.

Lyrics
TV version (Official Sentai Filmworks translation)

UMR! UMR! Not "uma", Umaru! (2x)

Always play with all your strength and spirit!

Enjoy yourself more and more, girl

So that no one notices

Okay, go! Himouto life

Wearing a hood 'cause I feel like it, lounging around again today

With my favorite food, potato chips in hand

Let's have a staring contest with the computer

A Chinese peony when I stand, a tree peony when I sit,

My walking form is a lily flower

A perfect high school girl everyone envies

But look, when I come home I transform! So let's be lazy

Forever the 3-way combo: eat, sleep, play

Always, always, games will be my friends

Big Brother is strict

But he always, always forgives me

Unlimited selfishness is the flip side of love

UMR! UMR! Not "uma," Umaru! (2x)

Alright, the end!