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21年前。 ある男の前に桃型のカプセルが流れてきた。その中には赤ん坊が乗っていてー そして現在。 デビュー作「初恋ヒーロー」でいきなり漫画賞を受賞した女子高生、鬼頭はるかに突然転機が訪れる。 謎の怪物に襲われ、謎のヒーローに助けられ、謎のサングラスをかけたら、謎の世界が見えてしまい…さらには自分自身が謎のヒーロー”オニシスター”にチェンジしてしまった！ わけがわからず困惑するはるかの前に現れたのは… ド派手な桃をオデコに付けた真っ赤なヒーロー”ドンモモタロウ”だった！！

Haruka continues her search for Tarou Momoi as he causes a woman that he works with to seek for a way to become younger.

Haruka unknowingly comes face-to-face with Tarou Momoi while he is on duty as a deliveryman; people all over are having their house lights stolen, including a new member of the team.

Tarou takes a temp job with Tsuyoshi's company; Haruka and Shinichi wonder if they can trust Tarou.

Tsubasa is corned by the police outside of Tarou's job, taking a clueless Haruka hostage in the process.

Tsuyoshi feels self-conscious about going to a party with his wife, unknowingly using mysterious "points" to improve his status after talking with a coffee shop owner.

Haruka signs up for a special class that ends up being taught by Saruhara; Tsubasa and Tsuyoshi chase down a vigilante Hitotsuki.

Tsuyoshi and Tsubasa bond over their lovers; an artist becomes frustrated about there being no muse for him at the restaurant when he stumbles upon Miho.

Haruka and Shinichi must feed Tarou to make him feel better; a child seeking playtime turns into a Hitotsuki.

Haruka uses Kibi Points to quit the Donbrothers, but another Oni Sister shows up in her place.

Tsubasa becomes sick after a run in with the police, putting himself in the care of Tsuyoshi who doesn't know what to do.

Tarou outs a co-worker for stealing food, causing everyone to be mad at him; Kaito hires a new employee at the coffee shop, which Haruka instantly dislikes.

After Tarou attempts to lie in order to praise the team, Shinichi gets fed up and has the team boycott.

After Tarou is slain by Sonoi, a man called Jirou Momotani heads to the big city with dreams of being a hero.

After using too many points to bring back Tarou, bad things start happening to Haruka and Shinichi.

Jirou just wants to be friends with his new teammates.

Tsubasa hopes to see Natsumi again on the one year anniversary of her disappearance.

Tarou offers Jirou the opportunity to be his equal by way of a punishment game; Don Murasame makes his presence known.

After being scolded by her aunt for being on the phone all of the time, Haruka discovers the ghost of a girl inside of a phone booth.

Jirou gets a call from his girlfriend who is coming to Tokyo and wants to lead the Donbrothers to impress her.

Shinichi is mistaken for someone else upon transforming into Saru Brother; Sonoza's love of Haruka's manga gets the best of him and he kidnaps her.

Haruka remains forced to create a sequel to her manga for Sonoza, but cannot get out of her slump.

A boy sets up a shrine for his late pet when Tsubasa disturbs it and is caught in a curse.

Tarou delivers a package to a woman who mistakes him for her son.

Tsuyoshi is fired from his job, but miscommunication arises when he airs his grievances to Tarou.

After watching the Kamen Rider Revice finale, Kaito decides that Donbrothers shall end too and wants to determine an MVP.

While enjoying a nice day at the pool, Tarou is challenged to a duel by Sonoi.

Tsubasa is spotted outsmarting some cops by a young woman who has her eye on something that she wants to steal.

Tarou is invited to Sonoi's funeral while Murasame asks Jirou about the meaning of life.

Haruka's aunt is kidnapped by Anoni in exchange for the Donbrothers to help them with the Juuto.

Upon realizing that their team still isn't complete, Tarou decides to take matters into his own hands to find out who Inu Brother really is.

Sononi and Sonoza challenge Tarou to a duel and everyone has a bit of deja vu.

Jirou cares for a barely alive Tarou as Sonoi tells the other Donbrothers of their leader's downfall.

Tsubasa asks Tsuyoshi for that dinner he promised when they first met; both the Donbrothers and Nouto take issue with Sonoi now acting like Tarou.

Tsuyoshi is dejected about Miho leaving to be with Tsubasa; the police reveal that they are conducting an investigation on the Juuto.

The others try cheering Tsuyoshi up while the Juuto disguised as Tsubasa runs amok in the city.

The Nouto are getting too attached to the Donbrothers and so the senate sends Sonoshi to supervise.

Kijino invites everyone to a fancy dinner with his reward money while a food critic who has lost her appetite roams about.

The Donbrothers are cleaning the shop when they stumble upon a button that unleashes Don Killer.

Haruka is signed up for driving school when Sononi notices that Tsubasa is being targeted by Don Murasame.

The Nouto have something to ask the Donbrothers when it's revealed that Santa is running around causing trouble as a Hitotsuki.

Saruhara is greeted by a scam artist and decides to create a fake family with the other Donbrothers to expose him.

Inuzuka remembers who saved him from the Juuto forest; Haruka discovers the true identity of her rival, Naoki Shiina.

Sononi convinces Tsubasa to once and for all defeat the Juuto that stole Natsumi's face.

Tsubasa asks if he can join Tarou and visit Jirou's hometown of Kakamura after becoming engulfed in Naoki Shiina's manga.

Tarou is now one with the Juuto forest as Sonoshi and his new friends give a warning to Sonoi and company.

The Donbrothers and Nouto have a meeting to consider Sonoi, Sononi and Sonoza joining the team.

Now that Sonoi and company have officially joined the Donbrothers, the team must work together to save Tarou and Tsuyoshi.

Tsubasa tries to help Tsuyoshi forget about Miho; Sonoshi stirs the pot by finding someone with unlimited Hitotsuki possibilities.

With Tarou losing his memory, he learns just how much his team has grown.