"We're always fighting our fears. We might end up dragging down our partner. We might end up failing to move our FRANXX correctly. We might become unnecessary. Will we be able to overcome our fears someday?"—Ikuno

Flap Flap is the fourth episode of DARLING in the FRANXX.


Mitsuru begins to recover, but it traumatized with his experience with Zero Two. In fear of what happened in the last battle, Zero Two is called back by the authorities to return to the front lines. As Zero Two is escorted to a transport with Strelizia, a Klaxosaur appears and attacks. The other pilots are dispatched to face it, but are overpowered by the enemy. Seeing Zero Two being taken away, Hiro finally makes his mind and urges her not to leave and become his partner instead. Zero Two then disobeys her orders and boards Strelizia with Hiro, which he manages to successfully pilot. The two then help the others to defeat the klaxosaur. Afterwards, Plantation 13 lifts off to rendezvous with Plantation 26, and Hiro resolves that he will pilot Strelizia with Zero Two, even if it kills him. 


Papa announces that Klaxosaur activity has increased, and large ones are showing up everywhere. An APE says the Nines are dealing with them for now, but they still have other tasks to complete. One asks how long Strelizia will be allowed to goof off, now that Hiro's aptitude has been ascertained, they have no reason to leave it there. Marmoset says that it isn't wise to let her mix with tainted stamens any longer.

Ep4 Mitsuru is terrified

Shaking in bed, Mitsuru is injuried and terrified.

Shaking in bed, Mitsuru is terrified and tells others that Zero Two is a being of demons who will kill him. Futoshi takes his untouched food and tells the group he hasn’t eaten since he got back. The group worries for his state of mind and health. Hiro walks in and asks what happened with Zero Two. Mitsuru tells him of Zero Two trying to completely devour him, including his blood, flesh, and soul, all while smiling. Mitsuru grabs Hiro and warns Hiro to not ride with Zero Two again or else she will devour and kill him before collapsing. Kokoro calls out to Mitsuru and Futoshi helps lay him back down.

At Mistilteinn, Ichigo approaches Hiro about his decision to ride with Zero Two again and states how she cannot trust her, especially after what happened to Mitsuru. She says that if the rumors are true, Zero Two will eventually kill him. Despite her warnings, Hiro persists on his desire to ride with Zero Two.

Zero Two rides in the elevator with Hachi and Nana. He tells her that she does not have free rein just because she has to kill klaxosaurs. Nana says they almost lost Mitsuru because of her. Zero Two says that as long as she has Hiro, she does not care and the rest are nuisances who are sure to die soon anyway. Nana says that the kids are her fellow pilots, even if they belong to different units but Zero Two doubts that. Hachi says that 016 (Hiro) will not be given permission to pilot. Nana says that HQ ordered her back to the front lines. Zero Two is not happy and Hachi says she is special, which she assumes to meaning she is not human. Hachi replies he is only referencing her skills as a pistil.
Ep4 Ichigo Ikuno

Ichigo requests Ikuno for help once more.

Hiro trains and thinks about Zero Two, the injuries on Mitsuru, and the rumors. He pilots the training unit and keeps running. The other members of Squad 13 discussed Hiro and Zero Two, as well as the partner killing rumor. Ichigo reminds everyone that if things do not change, they could also die at any time. Ichigo says that they need to defeat klaxosaurs without Strelizia and cannot mess up again so as to survive. Ichigo asks others to help her and work in a team. She notices Ikuno looking troubled and Ichigo offers her encouragement, especially that she needs to be there for Mitsuru as his partner.

To prepare for the kissing with Plantation 26, Plantation 13 switches to mobile setup. At the FRANXX dock, Zero Two stares at Strelizia. Hiro sees Zero Two and hides hastily. At Mistilteinn, Hiro bathes and thinks about the rumor again, as the next ride will be his second. Zero Two appears and asks Hiro to run away with her. She tells Hiro that he is her only partner and as long as he is with her, nothing else matters. Seeing her horns, he gulps. She asks if he thinks she is a monster as well. Before he can respond, an alarm sounds.

They detect a worm-type klaxosaur heading towards Plantation 13. Cursing, Mitsuru tries to get up, but struggles. Ikuno tells him to grab on to her and he refuses. Eventually he nearly collapses in her arms and she carries him while calling him stubborn. Hachi says that they have only detected one, but there may be more in hiding. He tells them to connect. Mitsuru says he hopes Ikuno can connect. She says she can and they connect after Ikuno touches on her left shoulder where Ichigo touched during the discussion. Mitsuru and Ikuno connect and the FRANXXs advance forward. Zero Two and Hiro go to the command room in their suits. Nana tells them they aren't deploying Strelizia. The FRANXX momentarily stop the klaxosaur, but another one appears behind them in the mist and grabs Argentea. Hiro and Zero Two watch and Zero Two says that they should help and asks who landed in the transport plane. A group of escorts arrive and Nana looks at the screen and says to Zero Two to do as they say. Nana says Zero Two is returning to the front lines. As a man takes Zero Two away, she bids Hiro goodbye. Nana then says that the order was from Papa and the rest. He asks if the partner-killer rumors are true. She answers that she's a special pistil who must keep fighting on the front lines and that she takes a toll on the stamen who become partners with her and that she isn't simply human.

As Zero Two walks through the hall, she turns and looks behind her where she sees Hiro come to a passage he cannot cross and yells to her. He says that he was afraid of riding together and he still is, but because he lacked resolve, not because she isn't human. Though he had been moping, he felt like he could fly with her. He realized that he never really cared about riding the FRANXX, but about riding with her. He asks her to stay. Zero Two stops and smiles and defeats the armed men escorting her. She approaches Hiro and says that nobody has ever said such embarrassing things to her before. He says it was a first for him too. Smirking, she asks if he wants to ride with her and he answers, embarrassed. They dance through the gate together and board Strelizia.

Nana appears on screen and orders them off, but Zero Two ignores her and hangs up. She asks Hiro if he is okay and he is nervous about piloting. She encourages him and they successfully connect.
Ep4 This is the first time that Hiro pilots a FRANXX successfully and consciously

Hiro rides with Zero Two consciously.

They fly through the air and Hiro is happy to be able to pilot. They zip to where the other parasites are struggling and quickly save them. Ichigo orders everyone where to focus. Strelizia rips it from the ground and reveals it was actually one long klaxosaur. After other FRANXXs fix the klaxosaur to the ground, Ichigo asks Hiro to help. Strelizia stabs its core, destroying it. Hachi announces that they neutralized it and to return to base.

Nana questions if Zero Two was always planning this all along. Hachi says that the numbers prove that Hiro is compatible with Strelizia. He wonders how Papa and the rest will react. Hiro narrates that he always dreamed of the day he could take flight, but now he may have found a pair of wings to call his own. Even if they destroy him, he is happy to at least fly once more.






STAMEN Hiro | Goro | Zorome | Futoshi | Mitsuru
PISTIL Zero Two | Ichigo | Miku | Kokoro | Ikuno
OTHER Naomi | Old Woman | 081 | 090 | 245 | 9'α | 9'β | 9'γ | 9'δ | 9'ε | 9'ζ | VIRM
APE Papa | Vice Chairman | Gorilla | Marmoset | Lemur | Baboon | Tarsier
Dr. FRANXX | Hachi | Nana
FRANXX Strelizia | Delphinium | Argentea | Genista | Chlorophytum | Standard | 9 Model
EPISODES 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12
13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24
CHAPTERS 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20
MUSIC KISS OF DEATH | Torikago | Manatsu no Setsuna | Beautiful World
Hitori | CÅGE | Vanquish | Escape | Darling
LOCATIONS Cerasus | Garden | Chrysanthemum | Gran Crevasse | Cosmos