Sekai currently at adventure guild, talking with Katherine about his finished commission until someone tap his shoulder. The elemental man looks behind him to see Aether and Paimon.
Sekai: Hey guys, sup?
Aether: Jean and Diluc asked us to help them retrieve the lyre.
Paimon: Also said she'll pay you.
Sekai: Jean will pay me? Why not Master Diluc? He can pay more, right?
Aether: *chuckle* Seriously if he gonna pay, we don't need to worried for Paimon food fun for a long time.
Paimon. Ha ha.. how funny…
Sekai just laughs, before saying good bye to Katherine and leave the guild with both Aether and Paimon.
A few hours past as traveler along his travel companion arrived at meeting place where both Diluc and Jean waiting for them.
The acting grandmaster told them on how to infiltrated Fatui hideout and get back the lyre without getting notice. They need someone who can blend in within them as they all look at Sekai, causing him to tensed up a little bit as they all look to each other before giving nod of approval.
After moment, Sekai currently wearing a mask that he finds out look like a leader of phantom thief.
Wearing it making him feel the spirit of trickster. He then does the action of ripping his mask, screaming...
Sekai: Persona!! Arsene use maeha!
Diluc: *sweatdrop* What are you doing?
Sekai: *smirking* Heh, you will never understand the heart of trickster.
Jean: Enough, you two, Aether will accompany you, Sekai.
Sekai: Okey fine. Aether, I know you also have spirit of phantom thief of heart. Form now, I will grant this mask giving you codename Skull. Also, you will call me Joker during this operation.
As Sekai trance on Skull shape mask and give it to Aether, and he wear while spoke
Aether: Yes Joker! Let make this operation successful, and steal that treas—I mean lyre back.
Paimon: But we technically taking back what actually ours. Why must we steal it back?!
Sekai: Shut up Mona, it's you that always sniffing happily on word treasure.
Paimon: What?! Paimon is Paimon not Mona!!
Aether: Come on Paimon, Mona is your codename for this operation, just roll with it.
Sekai trance on Mona mask and forcefully wear it on Paimon then trance mirror putting it infront of Paimon.
Paimon: Wha—hey Paimon have a cat ear.
Aether: Its Mona, stick to your role Paimon.
Diluc: *sigh* can we just focus on this operation…
Sekai: come on old man, I know also want a codename, right?... *smirking*
Diluc: N-No! why do I have to join your shenanigans brat!
Sekai: Just be true to yourself old man. Just close your eyes and feel the spirit of rebellion in your heart.
Aether: Yeah, Master Diluc, feel the burning passion of your pyro vision!
Diluc: H-huh?! I guess…
Sekai trance Fox masked and give it to Diluc and spoke:
Sekai: from now on your codename is Fox, treasure it, he was once a powerful swordman that slash injustice.
Diluc: O-okey…
Jean: Erm…
Sekai: Owh Jean you also want a codename, right?
Sekai trace Noir mask with her hat and give it to Jean.
Sekai: I will grant you a codename of Noir, as she once a noble in a day, and a fighter for justice in the night. Treasure it!
Jean: I-I… thanks…
-Inside Fatui hideout-
Aether and Sekai manage to infiltrate Fatui hideout thanks to their disguise and stealth ability. As they manage to blend in their rank. The two went to their main basement as they both went separate way and headed to different room to gather information and jump from one corner to another one, until he finds the lyre. As he was about to grab it, he heard some people footstep coming to his way. As he turned around finding two Fatui guard with their weapon on hand as Sekai look at them.
???: Who are you, Identify yourself!
Sekai: I… (crap this is bad)
The guard were getting closer with their weapon rise until he finally spoke to them.
Sekai: I'm… Wait Codename Joker! (Yeah! I manage to act like Joker, that one check out from my list)
As the two guard raised their eyebrow looking at him.
???: Okey then, Joker what you are doing here?
Sekai: Boss order me to pick up the lyre and deliver it to her.
???: That's odd, La Signora never said anything about that.
Sekai: (La Signora? Sound like Dora the Explora… what kind of parent give their kid that kind of name)
The guard look at him with doubtful look on their face as Sekai know he about to be discovered. He then Solar Leap on top of the Fatui and reap his mask while saying
Sekai: I reveal your true form!
Then Sekai jumps in front of the Fatui ready himself for fight. The unguard Fatui look at him confuse and seeing his face, Sekai starts to taunt him.
Sekai: That why you wear mask, your face looks so generic that even pebble beside road is more memorable than you!
???: What you saying brat!!!
As the angry Fatui charge at Sekai, suddenly he heard familiar voice move fast from right.
???: Wind Blade!
The angry Fatui caught off guard as powerful wind attack hit him sending him collide to another fatui agent towards wall knocking them unconscious. Sekai walks and High Five Aether.
Sekai: Thanks for backup Skull.
Aether: Welcome Joker, you might wanna need this again.
He said as he tossed grapple gun back to Sekai. Sekai then launches the grapple hook towards lyre and pull it back to him instantly storing it into his inventory.
As they ready to meet up with Diluc, they were block by several Fatui agents. Aether looks at Sekai asking if he have any way to run pass them. Sekai Smirk and trace on smoke bomb.
Sekai: Phantom thief should act like thief.
He then throws the smoke Bom on ground, while the smoke covered the area, Sekai grab Aether hand and used Solar Leap passing them. Then both of them continue running towards exist.
As both travelers emerged from the Fatui base, they were greeted by Jean, Diluc, and Paimon, who had been waiting anxiously.
Sekai raised a hand in greeting, a grin playing on his lips.
Sekai: Yo! We got the holy lyre.
With a casual flick of his wrist, he pulled the sacred instrument from his inventory and handed it over to Jean. The moment it left his grip, the weight of their mission settled in—the lyre was in rough shape, its strings barely holding together.
Jean carefully examined it, her expression tightening.
Jean: It's damaged… but with more Teardrop Crystals, we should be able to restore it.
With their combined efforts, the lyre was finally repaired, its glow returning with a gentle hum of Anemo energy. Without wasting time, they set off for Starsnatch Cliff, the wind carrying their hopes as they prepared to summon Dvalin.
However, just as the melody began to take shape, an Abyss Mage materialized, its eerie laughter cutting through the night air.
Abyss Mage: You naive fools. Do you really think you can save him so easily?
A dark aura crackled as the mage's words slithered into Dvalin's mind. The dragon, already hesitant, recoiled. His roars echoed across the cliffside, laced with confusion and pain. Then, with a powerful gust of wind, he broke free from their grasp, the lyre shattering in the process.
Sekai's hand clenched into a fist as he watched Dvalin disappear into the horizon.
Sekai: Tch… we were so close.
Jean's expression darkened, her voice firm despite the setback.
Jean: We're not done yet. We'll find another way.
As the broken pieces of the lyre on Venti hand, the night felt heavier than before. The battle to save Dvalin was far from over.