The MizuRuiSakiToya song for WL3 is just a masterpiece. From Mizuki and Rui being scared that they're still alone, to Saki and Toya thinking they're dragging their groups down, to all of them having thoughts that they don't belong and that they're making it worse for everyone, and waking up remembering that they're with people that actually care for them and wouldn't abandon them.
One thing I want to point out is why Kaito was chosen for this song. Yeah, they're mostly going off of what genres or styles are common for the Vocaloids (aggressive for Meiko, more upbeat for the Kagamines and Miku), but the lyrics also apply to Kaito as well. From being the butt monkey of the Crypton series, being the least popular for a long period of time, even getting shafted by fans during an after party for Miku Expo by being the only one to not get a special drink:
And then he wakes up to find people that because of Sekai, love his voice, are working on using it, or just huge fans of his characterization in the different Sekais we've visited. I think it's sweet for him to be the one singing this song to show that he's not the forgotten one anymore, that he truly has a place to belong in the Crypton series.
