History Heartwarming / KamenRiderDenO

* In ''Climax Deka'', we have the first on-screen interaction between Ryutaros and Airi: she visits the detective agency to give them hand-made bento boxes, and when she sees Ryuta she immediately busts out in a smile. He hides like a shy child, but she goes over to him and gives him his bento. Considering his crush on her was what [[LoveRedeems helped redeem him]], seeing her accepting him as part of the family is especially adorable (and makes one hope that she feels the same way about the other Taros).

** [[spoiler: Heck Ryotaro, after tying a piece of cloth to the teach next to it while in the past, digs up for him, in the middle of the rain. Hana even helps him dig it up.]]

* Deneb is utterly ashamed that he cost Yuto the card and runs away from home. When he finally comes back, he tries again to apologize to Yuuto for it, only for Yuto to declare that the cards are meaningless and throw the last one into the water, effectively saying that Deneb is more important to him than Zeronos. Doubles as a funny moment, since a cut at the end of the episode has them searching for the card in the water.

* When Kai [[spoiler:allegedly succeeded in killing Yuto when he was a high-school student]], we briefly glimpse how Oozaki and Miura would have lived if they'd never become infatuated with Airi. Oozaki would have kept on womanizing, of course, but Miura would have found a woman who loved him back. His lone appearance in the episode shows him with his infant daughter, who he clearly loves very much.
** Doubles as a tear-jerker when, at the end of the episode, [[spoiler: Yuto's existence is restored and]] Oozaki and Miura are back to competing over Airi, who still doesn't notice their feelings.

* Final episode. When everything looks bleak at the loss of the other Taros and it looks like Momo's going to disappear himself while they're trying to protect Airi and their era, Ryotaro finally makes the wish that Momo had asked of him since ''episode 1''.
-->'''Ryotaro:''' I'm going to tell you my wish.\\
'''Momotaros:''' ''(pause)'' Let me warn you. I won't hear any wishes that I can't do.\\
'''Ryotaro:''' Will you... ''(thinks back to Urataros and Kintaros pulling a YouShallNotPass)'' ...fight with me until the very end?\\
'''Momotaros:''' ''(beats up several Mole Imagin after a longer pause)'' Your wish... has been heard.
** A scene in the director's cut of the finale explains why Ryutaros wasn't present despite not having an on-screen HeroicSacrifice: he was afraid of disappearing and couldn't bring himself to help fight. As he cowers in the [=DenLiner=], Naomi approaches him and comforts him, telling him that it's okay to be afraid. Considering Ryutaros is very much like a child, it's easy to understand how scared he was--and he ends up helping Ryotaro anyway in the final battle.
* From the first two episodes. The VictimOfTheWeek NeverGotToSayGoodbye to his mother before she died. Ryotaro manages to make it so he gets there in time to spend her dying moments with her.
* Ryotaro goes out of his way to save Sieg in episode 24, and Sieg earlier was willing to use the last of his strength to save his own "mother" from being kidnapped, even though it would kill him.
* At the end of ''Ore, Tanjo!'', Owner sets it up so Ryotaro gets to see his parents as they leave the hospital with himself as a newborn.
* The end of the series, [[spoiler:where Yuto thinks Deneb vanished after Kai's defeat, and returns to the [=ZeroLiner=] to discover Deneb left him a meal with a note asking him to eat it and keep up his strength. Breaking down in tears, Yuto starts eating, even the shiitake he despises. When Deneb turns up alive, rather than being comically annoyed as usual, Yuto just hugs him.]]
** Ryotaro's own version of the scene is similarly heartwarming, but not quite to the same extent since we see [[spoiler:the Taros alive earlier, and acting goofy, which is a little of a MomentKiller.]]
* The arc with the time capsule. [[spoiler: The person who contracted it is trying to find it because his deceased wife had buried something precious. At the end of the arc we find out what it is, an old pair of boxing gloves because he gave up boxing to live his life with his beloved. The man breaks down into tears.]]

* The revelation of [[spoiler:Yu's identity]] in ''Onigashima Battleship'' might have been a little obvious, but it was still sweet.
* In the episode where Kai [[spoiler: succeeds in killing Yuuto when he was a high-school student]], we briefly glimpse how Oozaki and Miura would have lived if they'd never become infatuated with Airi. Oozaki would have kept on womanizing, of course, but Miura would have found a woman who loved him back. His lone appearance in the episode shows him with his infant daughter, who he clearly loves very much.
** Doubles as a tear-jerker when, at the end of the episode, [[spoiler: Yuuto's existence is restored and]] Oozaki and Miura are back to competing over Airi, who still doesn't notice their feelings.
* In the episode with the courage test, the fact that Yuuto was willing to use one of his 2 remaining Zeronos Cards to save Deneb who he thought was in trouble. While he beats him up afterwards, it's still very heartwarming.
** From the same two-parter, Deneb is utterly ashamed that he cost Yuuto the card and runs away from home. When he finally comes back, he tries again to apologize to Yuuto for it, only for Yuuto to declare that the cards are meaningless and throw the last one into the water, effectively saying that Deneb is more important to him than Zeronos. Doubles as a funny moment, since a cut at the end of the episode has them searching for the card in the water.

* Final episode. When everything looks bleak at the loss of the other Taroses and it looks like Momo's going to disappear himself while they're trying to protect Airi and their era, Ryotaro finally makes his wish that Momo had asked of him since ''episode 1''.

* In the episode with the courage test, this troper found it touching that Yuuto was willing to use one of his 2 remaining Zeronos Cards to save Deneb who he thought was in trouble. While he beats him up afterwards, it's still very heartwarming.

* In the episode with the courage test, this troper found it touching that Yuuto was willing to use one of his 2 remaining Zeronos Cards to save Deneb who he though was in trouble. While he beats him up afterwards, it's still very heartwarming.