Indeed, for this one it seems that she actually sings it all in a studio and then is edited in the video For the others they sing in a studio then use it as the audio, then they act as if they are singing, which looks weird often, but is easier because they don't have to worry about the " Acting " while they sing
The sun came flying down into the city. The hazy, red world it created was so beautiful. The noisy voices of people passing by Distort inside my eardrums, like a blockbuster hit! taiyou ga machi ni tobioritekita akaku yureru sekai ga totemo kirei datta yukikau hitobito no sanzameku koe ga komaku no naka de nejirete goraku eiga mitai da Wishing to be relevant… in an irrelevant, disconnected world, I’m addicted to peering down from above, like a ghost- I’m still trying to make out my own silhouette! tsunagaranai kankei nai sekai ni kankei shiteitakute fukan chuudoku, yuurei mitai watashi wa jibun no rinkaku o tashikameteiru Y’know, Within those eyes that wished for a tragedy, I’m searching for a place to return to. In a city full of imitations, I’m seeking something to believe in. nee higeki o hosshita sono me no uchigawa de kaeru basho o sagashiteru nisemono bakkari no machi no naka de shinjirareru nanika o Anonymous. I want to have a conversation using real words… with our real voices… Anonymous. If someone is listening, please respond! anonimasu hontou no koe de kotoba de hanashi ga shitai no anonimasu dareka kiiteiru no nara, outou shite yo The sun climbed high into the sky. The world began to glimmer, but appeared monochrome. As if being sucked into a repetitive cycle, No matter how much I struggle, there’s still no way out today! taiyou ga sora e takaku nobotteitta kiramekidasu sekai wa monokuro ni mieteta kurikaesu saikuru ni suikomarenu you ni aragattemitemo kyou mo nukemichi wa nakute People walking through the city are all so expressionless, when in fact they’re really full of distortion. If they could just break that shell they’re keeping up And let it all out at once… machiyuku hito wa mina muhyoujou de sono jitsu tainai ni hizumi o tataete toritsukurotteru sono kara kowashite subete isseeno de afuredashiteshimaeta nara On the other side of those coldly smiling eyes, just what were you trying to grasp? Amid pages filled with nonsense, I yell, wearing my true face. tsumetaku waratta sono me no uragawa de nani o tsukamou to shiteita no? zaregoto bakkari no peeji no naka de hontou no kao de sakebu yo Anonymous. If you have something to say, show yourself! Anonymous. Not just on a screen-raise your voice! anonimasu iitai koto ga aru nara sugata o misete yo anonimasu gamenjou nanka janaku koe o agete Unable to sacrifice each moment, each sound, I want to live, burning this life bright! So let’s seek out… with our five senses, The kind of pain and joy that make precious tears overflow- The feeling… the force… of being able to say, “I’m alive!” yuzurenai isshun, ichion o inochi moyashite ikitemitai no itoshikute namida afureru you na itami o yorokobi o mitsukedase gokan de ima “ikiteiru” jikkan o shoudou o Y’know, Within those eyes that wished for a tragedy, I’m searching for a place to return to. In a city full of imitations, I’m seeking something to believe in. nee higeki o hosshita sono me no uchigawa de kaeru basho o sagashiteru nisemono bakkari no machi no naka de shinjirareru nanika o Anonymous. I’ll shine my light, declaring war! Anonymous. If it’s reaching you now, please respond! anonimasu koko ni sensenfukoku no hikari o tomosu yo anonimasu ima todoiteiru no nara, outou shite yo