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• When Miku wakes up, an elated smile appears on her face as she knows what day today is.
• Today is August 31st, her birthday!
• While on her computer, Miku smiles and blushes as she scrolls through numerous birthday messages sent to her by her fans.
• When she goes outside, her smile grows as she sees a mountain of birthday cards, letters, and presents at her door.
• The blue-haired pop star is utterly delighted when her Vocaloid pals surprise her with gifts and a vanilla buttercream cake shaped as a leek.
• Rin, Len, Luka, Kaito, and Meiko each take Miku somewhere fun to celebrate her birthday.
•Miku and Rin go to a shopping mall in Koshigaya, Saitama. While there, a montage begins as “Suki Kirai” starts to play. In the montage, Miku and Rin shop in various stores, try on different cute outfits in a changing room, get their pictures taken in a photo booth, get their nails done at a salon, and run and hide from paparazzi. The girls breathe a sigh of relief and continue with their day when they see that the freelance photographers are gone. Later, Miku and Rin are approached by two hyperexcited cosplayers dressed as them. The Miku cosplayer takes out her phone and asks if she and her friend can take a picture with them. Miku and Rin give the two a nod of approval and take a bunch of pictures with them, ending the montage.
• Len takes Miku to an arcade in Akihabara. The two play various games together like Pac-Man, a shooting game, a racing game, a fighting game, Taiko no Tatsujin, and Dance Dance Revolution (In the DDR game, various Vocaloids are shown as playable characters. Miku and Len play as themselves and the songs they select are Vocaloid songs such as “Soar”, “Yellow”, and “Butterfly on Your Right Shoulder”). Before they leave, Len wins a Miku plushie in a claw machine for Miku.
• Miku and Luka head to a cafe in Shibuya to snack on some sweet treats. They bring Hachune Miku and Tako Luka along with them. At the cafe, Miku and Luka cheerily eat sweets that are themed to look like them, while Hachune and Tako have a fun, over-the-top food fight in the background. Miku and Luka don’t notice the utter chaos that their chibis are causing. After that, the four go to a Mt. Fuji Hot Springs.
• Kaito takes Miku to a Cold Stone Creamery in Shinjuku for ice cream. Because it's her birthday, she receives free ice cream.
• Miku and Meiko go see a movie together in Osaka. They then proceed to a karaoke bar located nearby to sing their hearts out. Everything is going fine as the two take turns singing until Meiko decides to have too much to drink and gets extremely drunk. Miku now has to help the older lady sober up.
• At Miku’s birthday bash concert, Rin, Len, Luka, Kaito, and Meiko all perform the song “Birthday Song for Miku” for Miku. The twintail singer tears up with joy and thanks her friends for such an amazing song and performance! For the rest of the concert, Miku sings some of her favorite songs while wearing her 2020 birthday dress!
•The songs she sings are “World is Mine”, “Melt”, “Po Pi Po”, “Ai Kotoba”, “Tell Your World”, “Miku Miku Ni Shite Ageru”, “The Snow White Princess Is”, “The Intense Voice of Hatsune Miku”, “Romeo and Cinderella”, “Senbonzakura”, “Rolling Girl”, “The Disappearance of Hatsune Miku”, “Levan Polka”, “Kocchi Muite Baby”, and “Weekender Girl”.