Board Thread:Questions and Answers/@comment-2602:306:37F8:7A30:AD00:316E:2F8C:B523-20180123081822

I remember a Rin Kagamine song with a simply cutesy art style where she goes around energizing stuffed animals with a wind-up key as some sort of rounds she has to do every day, I think she and a toy walk down this colorful piano/xylophone/train tracks thing during the bridge and it's got some bittersweet undertones like the wind-up key makes Rin tired because she's spending so much time being selfless or she subtly talks about the toys having depression/heartbreak or something, she also might have had a backpack to keep the toys or one specific toy in?

Thank you in advance for any help you can offer! 