| To explain the background behind the two previous songs, the events of this song happened before, during and after the events of Pretty Panties ☆ Aku MaRin and Pretty Fundoshi ☆ Aku MaLen.
It started with a timid Kagamine Rin in her room, who was practicing her confession to Len in front a mirror. Incapable to overcome her shyness she made a wish to the mirror, wanting more courage to express her feelings for Len. To her surprise the mirror answered, her reflection replaced by a girl identical to her with a punkish and devilish attire. Surprised, Rin asked where and who she was.The girl chuckled and said that she is inside of the mirror, and then introduced herself as "Pretty Panties ☆ Aku MaRin".
After she left the mirror, the Demon Girl started a conversation with Rin. After Rin asked her about her strength the Demon Girl said the "magic word" Rinrenraririn, which transformed her into a Demon too... but the Demon Girl just took Rin's clothes off (just like in the previous songs).
Embarrassed, Rin began to cry, while Aku MaRin says that she should stop the tantrum and that kind of frilly dresses aren't going to work to conquer Len's heart. After she received her Demon Lolita attire Rin transformed into Aku MaRin, ready to go on a rampage.
Meanwhile, Len is in his room, complaining about the Christmas when he turns to his window just to see GackpoSanta Claus. The girls in Rin's room see him too, and afraid he would interrupt their plans, they blasted him away and assaulted Len in his room, leading to the events of "Pretty Panties ☆ Aku MaRin".
After the failure of the first song, the girls regroup in Rin's room, and with a freakier idea, MaRin suggests Rin to use her tongue to win Len's heart (ironically, it worked in the end). After a bit of practice they began her second assault, triggering the events of Pretty Fundoshi ☆ Aku MaLen song.
After another failure, Rin insists in confessing her feelings. Aku MaRin suggests to her to practice her confession with her, managing to spit it out. This causes that Aku MaRin kiss her which triggers a fusion of both girls.
Meanwhile, outside Rin's room was Len with Gackpo, preparing to assault Rin's room and put an end to this. Gackpo asked if enough "armor" as Len is barely dressed with a fundoshi, Len says that he shouldn't worry. He enters to the bedroom just to discover that he committed a deadly mistake: Both girls are now fused in a powerful and voluptuous Demon Queen.
Unable to control her tongue the fused MaRin swallows Len in one gulp. Then parodying El Shaddai: Ascension of the Metatron's gameover/continue sequence, the time was reversed to the moment when Len was preparing to enter to Rin's room. This time Len ask to Gackpo his best armor which resulted to be a Princess dress and enters to the room for the final battle.
Parodying a button mashing sequence, Len and the fused MaRins engaged in a "tongue battle". In the middle of the combat Len asked what's wrong with them and why they are after him. Rin replied shyly that she wanted to tell him something and finally spits out her confession, causing that their tongues tangle up and forcing up a kiss between them.
Len, confused, woke up just to find himself in a comprising situation. Meanwhile he tried to understand what's going on MEIKO, KAITO and Miku enters to the room. While MEIKO and KAITO congrats to Len for his "achievement" Miku panicked screams "Noooo! The world isn't ready for this". The video finally ends with zoom out of the house and the scream of the humiliated Len.
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