* Let's face it: The [[VisualNovel/FateStayNight Fifth Holy Grail War]] was awesome, but how many got any happiness out of it? So seeing the Masters and the Servants peaceful, happy and loving each other is impossible to frown at.
* Shirou and Rin's "cat-pajamas" sex-scene...or more accurately, ''love''-scene. For a refreshing change in the Nasuverse, it was a moment where both parties took joy in the act, and the absolutely ''adorable'' smile that Rin wore through the whole sequence will warm your heart as much as it will set it racing.
* That Caster and Souichirou are [[spoiler:married]] after all the things they've been put through in the original game is heartwarming in itself.
** We also get a look at Souichirou's feelings on the matter. While he doesn't really understand his own feelings on the matter (being basically emotionless for his whole life), he actually does have ''feelings'' thanks to Caster. And judging by his actions, they aren't bad ones.
** Caster and Kuzuki's backstory is a mix of Heartwarming and devastating TearJerker, but possibly the warmest moment is the recount of the first time Kuzuki, raised as a HumanWeapon ever since he was a TykeBomb, meets Caster... and his heart, that had beat the same regular beat for ten years without variation, [[LoveAtFirstSight skips a beat]].
** In the Hanafuda minigame Caster is shown making a lovely little scarf for Souichirou. And in their winning sequence he puts it on.
* Overlapping with CrowningMomentOfFunny, Shirou teaching Saber how to swim.
* Saber just having a normal day of playing soccer with kids. Leads to [[DoesNotKnowHisOwnStrength several funny moments]], but just seeing poor Saber being NORMAL is heartwarming.
* The backstory of Shirou and Shinji's friendship is essentially this, more so when looking back at all the bad blood between them in ''Fate/stay night''.
-->'''Shirou''': ''He watched me as he made fun of me for staying behind to work, but in the end, he never left. Harshly, he said,''
-->'''Shinji''': "You must be an idiot... You know you're just being used, right?"
-->'''Shirou''': ''He kept bothering me like that the entire time. And finally, in the early hours of the morning...''
-->'''Shinji''': "Hmmm. You may be an idiot, but you're a good worker, aren't you?"
-->'''Shirou''': ''And he gave me a friendly smile, just as proud as if he'd made it himself.''
* Right at the very end, when [[spoiler:Angra Mainyu reveals to Bazett, in despair at the thought that she'll cease to exist if he ends the GroundhogDayLoop, that he actually ''saved her life'' when Kotomine tried to murder her six months ago and she never was DeadAllAlong]]. Combined with TearJerker because [[spoiler:while she gets to pass through the door back to life, he [[HeroicSacrifice has to pass through the door returning him to oblivion]]. But that's OK because this was all for Bazett's benefit in the first place.]]
* Ilya and Shirou walking in the Einzbern castle courtyard while it's snowing, with Ilya bouncing around and talking with Shirou about the nearby walnut buds, [[CallBack mirroring]] the scene between Ilya and Kiritsugu from ''LightNovel/FateZero''. They wind up talking about the original scene right after.
* Ilya inviting Shirou to sleep with her in her bedroom because of where he's forced to sleep is so sweet it will send your heart a-flutter.
* Overlaps with Tearjerker...but Archer, when defeated by Saber...reveals that, no matter what he went through...he never forgot her. He never stopped loving her.