Getting the Chance Time Bonus for "Continuing Dream" in F wherein Miku, Luka, Rin and Len join hands and reach out to the player at the end of the song.
The chibi Vocaloids' hard work and the revival of the world in "God-Tier Tune."
The birthday events in F, especially the one for the player.
Several of the Item Events where the recipient is super gleeful and appreciative of the gift they received, doubly so if it's flowers or a stuffed animal.
The words for Tell Your World, where Miku is actually singing of the very fact she wants to bring together the entire world with her songs. It's impossible, when you actually understand the words, for you not to want to say "Yes, Miku, We're listening, keep going, you're doing great."