^ This single at least is definitely very reminiscent of Kana Nishino, hasn't she also been doing the same kind of cute-country-ish stuff as Princess lately? Is it a whole j-pop trend that miwa is trying to get in on, 'cause I feel like I've seen some other singers doing a similar thing lately?
I'll try to put together a list of not-cute miwa songs I like post-guitarissimo, but I'll warn you, our definitions of cute may not match perfectly.

And honestly, many of her cute songs are also worth a listen!
Spoiler:
From
guitarium:
- Ikutsu ni Nattemo (kinda cutesy, very similar to Arienai!! from guitarissimo)
- Kataomoi
- again×again
- Chasing hearts
- Hajimari wa Owari ja nai
From
Delight:
- Delight
- Hikari e
- Sayonara
- Sparrow
- Miracle (more than a little cutesy, but a big fave of mine)
- LOUD! ~Yuuutsu wo Buttobase~
- Napa
- Nukumori
(You might notice that I REALLY like this album... honestly, just listen to the whole thing

)
From
ONENESS:
- ONENESS
- Faith
- Gesshoku ~winter moon~
- Faraway
- Kibou no Wa
Others:
- Wake Up, Break Out! (from don't cry anymore single)
- Soba ni Itai Kara (from Little Girl single)
- Amayadori (from chAngE single)
- don't cry anymore (from Otoshimono single)
- Yozora (from Yozora single)
- The whole Anata ga Koko ni Ite Dakishimeru Koto ga Dekiru Nara single
- Any version of Hikari e or Delight you can find
Agreed with Yoake and mellody about Princess and the whole single: pretty average, nothing outstanding. I didn't find Shanranran annoying like I'd thought I would, but that's some damn faint praise right there. I'm also hoping for a more serious sound for her next release, would love another more rock-ish song.