You return to Nascita to find Ryuji and Mikoto working.
Ryuji: There you are. We need you to serve them.
He points to four people and you walk over to them.
Y/N: Hello.
???: Oh, you were that guy who was in the hospital.
You recognize him as the doctor who helped you.
Y/N: Oh. Hello.
???: How are you doing?
Y/N: Aside from the wound reopening a little, nothing too serious.
?????: Did the intern mess up the stitches?
???: Hiiro, you need to have better faith in my skills as a doctor.
Asuna: I think you did rather well.
Hiiro: Don't encourage sloppy work.
?????: Man... You're always so uptight... The pro did a pretty good job. Clearly the patient has been moving around a lot which could cause the wound to reopen.
???: Thank you, Kiriya. But Y/N, what have you been doing to reopen the injury?
Y/N: Um... I've been working a lot around here for one thing. What will you all have?
???: Just an iced coffee.
Asuna: I'll take a honey coffee with a slice of strawberry cheesecake.
Hiiro: A slice of chocolate cake, a slice of strawberry cheesecake, and a slice of your apple pie.
Kiriya: And I'll take a cappuccino with a bit of chocolate in it.
Y/N: Of course.
You give the order to Mikoto and she starts making the coffee and you bring the cake and pie to the table.
Y/N: Your drinks will be ready shortly.
Meanwhile, Hyoki is joined by Ayuko in the Shinobi's bedroom.
Hyoki: Alright, Ayuko. You remember the plan, correct?
Ayuko: Yes. I'm to get Build to lower his guard and you'll strike him.
Hyoki: Correct. But before that, Blood Stalk is to gather as much information on each of Build's Fullbottles.
Ayuko: Very well.
Back to you.
Asuka: Y/N!
Asuka and her team walks in and greet you.
Y/N: Hey, girls. Here to lend a hand? We could use the help.
Ikaruga: Of course. We'd love to help.
There is a sudden explosion outside. Having a guess as to what it is, you, Ryuji, and the Hanzo team run out but your doctor follows. And you see Blood Stalk.
Blood Stalk: Alright, where's Build?
Ryuji: Asuka, keep him busy for a second.
Asuka: Right. Let's go, girls! Shinobi Tekkai!
She creates a barrier and they draw their weapons or in Katsuragi and Hibari's case, take a fighting stance.
The girls keep Blood Stalk distracted and you and Ryuji put on your Drivers. You get out two Fullbottles and Ryuji gets the Cross-Z Dragon ready.
Your Driver: Kujira! Jet! Best Match!
Ryuji's Driver: Wake Up! Cross-Z Dragon!
Both Drivers: Are you ready?
Y/N & Ryuji: Henshin!
Your Driver: Amakakeru Big Wave! KujiraJet! Yeah~!
Ryuji's Driver: Wake Up Burning! Get Cross-Z Dragon! Yeah~!
???: You're Kamen Riders too?
Build: Oh... I... Didn't see you there.
Cross-Z: Wait... "Too"?
The doctor pulls out a strange game cartridge.
Emu: Emu Hojo. Kamen Rider Ex-Aid. Let me lend a hand.
He puts on a bright green Driver and presses the button on his cartridge.
Cartridge: Mighty Action X!
Emu: Henshin!
Emu's Driver: Gashat! Let's Game! Meccha Game! Muccha Game! What's Your Name? I'm a Kamen Rider!
Emu turns into a chibi Kamen Rider, leaving the two other Riders confused.
Build: Eh?
Ex-Aid: This is just Level 1. Dai Henshin!
He opens the front of his Driver and the chibi form breaks apart to reveal a new form.
Driver: Gacchan! Level Up! Mighty Jump! Mighty Kick! Mighty Mighty Action X!
Cross-Z: Okay, that's pretty cool.
Ex-Aid: Let's go.
The three Riders charge in and Blood Stalk sees them.
Blood Stalk: There's three of you now?
Ex-Aid: Consider me a temporary party member. Now.
He presses the button on the side of his belt.
Belt: Stage Select!
The surroundings change to a large field.
Ex-Aid: I'll clear this with no continues!
Cross-Z: I have a feeling that I can't lose!
Build: I now have the winning formula!
The three Kamen Riders attack and Blood Stalk attempts to counter despite the difference in numbers. Ex-Aid pulls out a strange hammer and smashes it against the Cobra themed villain and sends him flying a bit.
Blood Stalk: So annoying... Time for some reinforcements.
He pulls out a vial and opens it, pouring it's contents on the ground and several monsters appear.
Cross-Z: Nice trick. Gave us some pins to knock down!
Cross-Z and Ex-Aid charge at the monsters while you fly at Blood Stalk, shooting lasers at him from the Drill Crusher.
Blood Stalk: Why must you get in our way?!
He launches a giant energy cobra at you but you switch the Drill Crusher to Drill Mode and use it to go straight through the attack and deliver a powerful strike.
Build: So long as I'm alive, your evil plans will never come to pass!
Ex-Aid kicks away a monster and runs up to help you while Cross-Z finishes off the monsters. You turn the crank on your Build Driver while Ex-Aid places his Mighty Action X Gashat in the side slot on his belt.
Build's Driver: Ready... Go! Vortech Finish! Yeah~!
Ex-Aid's Driver: Kimiwaza! Mighty Critical Strike!
You punch the ground and the earth beneath Blood Stalk becomes water and an energy whale tosses him into the air, allowing Ex-Aid to finish him with a powerful kick. The Cobra themed villain hits the ground and struggles a bit.
Blood Stalk: Damn you... This isn't over!
He vanishes in steam and the surroundings return to normal.
Asuka: Are you guys alright?
Ikaruga: You just vanished.
Hibari: Is that another Kamen Rider?
Ex-Aid: Well... Looks like you guys are pretty skilled. I wouldn't mind teaming up with you again.
Build: Same.
Ex-Aid presses his Stage Select button and vanishes.
Cross-Z: So... He was unique.
Build: And I think he just ditched his friends with the bill.
Meanwhile...
Hyoki throws Blood Stalk at a wall.
Hyoki: You cowardly little snake! You failed to kill Build and you dare to come back to me empty handed?!
Blood Stalk: Calm down...
He gets up and stretches.
Blood Stalk: When Build struck me with his weapon, he failed to notice the little gift I gave him.
Blood Stalk pulls out a tablet and types on it, showing your exact location to Hyoki.
Blood Stalk: We just need to go to him.
Hyoki: A tracking device. Clever. You're not as useless as I thought. Ayuko, prepare yourself. You'll be killing Build yourself.
Ayuko nods silently as she holds up her Transteam Gun.
Ayuko's Thoughts: Y/N L/N, prepare yourself for death...
End of Part 7