Another Day, Another Song! Let's Go~
Maware! Setsugetsuka by Utagumi Setsugetsuka (Machine-Doll wa Kizutsukanai)
I don't know guys...I've fallen into a deep hole where only cuteness is present ★,★/ and I can't get out! Loved the anime, loved the characters and loved the soundtracks specially this ending song. Not only I love Yaya but this song matches perfectly with her personality. Just listen to the beginning "Se~no! Ichi ni san hai!" it's just adorable. Unfortunately, I do have to warn you that there is some Ecchi sections in the music video.
Here's the full song for the full experience! This will be a song stuck to your head for years specially "ha ha ha ha haiya~" and "Saa Saa Saa" my goodness I wish all the songs were like this xD I would also like to take the big ecchi parts out of it but then again anime goes hand in hand with ecchi so it is what it is.