Ouran High School Host Club/Heartwarming

"Tamaki: But I'm sorry...."
 * Episode 9: The Host Club's Straw Feminist rivals from the Zuka club are trying to lure Haruhi away and it doesn't help their chances of keeping her when it's revealed that they actually sold one of her mechanical pencils as a souvenir. After Haruhi storms out Tamaki comes up with A Simple Plan to keep her. When she shows up with the Zuka club the next day, she finds the Host Club (minus Mori) in drag, singing an improvised theme tune. As the Zuka club stare in shock, Haruhi literally laughs until she cries as she's chased around the room by crossdressing Yaoi Guys. Heartwarming for three reasons: The fact that the Host club were willing to go in drag for her, Haruhi's joy and amusement at what they did, and the fact that, naturally, she was never going to leave in the first place.
 * The end of episode 11. Nekozawa runs out under bright sunlight (which he is deathly allergic to) to "save" his little sister Kirimi from a cat. He does, but collapses to the ground shortly afterwards. Three days later, Kirimi finds him in their mansion, dressed in his usual dark attire (which she had previously been terrified of). She grabs his cloak, looks up at him, and smiles.
 * This troper is quite fond of episode 8, when Haruhi leaps at Tamaki in fear, and he whispers that she doesn't have to be alone any more. Gets me every time.
 * After spending the entire episode trying to find what can scare her, he is very protective and tries to make her feel better. The thing that seals it, however, is that he doesn't tell anyone else in the Host Club, trying to be nice to her instead of winning the challenge.
 * And then there's how he saves her from drowning.
 * On a related note, when Tamaki finally does tell him about Haruhi's fear of thunderstorms in episode 16 Hikaru does everything in his power to comfort Haruhi instead of teasing her. It's a massive Character Development and his first truly non-selfish act in the anime.
 * Episode 14, Tamaki and Haruhi are in the pavillion in the hedge maze. Tamaki tells Haruhi the story of his childhood. In the Host Club, Tamaki would have been covered in sparkles, the background changes into a carpet of roses. Instead, he's surrounded by actual climbing roses and there's not a sparkle to be seen. There couldn't be a better way to show that Tamaki really feels something for Haruhi - whether he knows it or not. The string-heavy rearrangement of the opening theme helps, of course.
 * For this troper, the scene in the final episode is this in addition to a Crowning Moment of Awesome for both Haruhi and Tamaki.
 * Volume 12 of the manga, when Kyoya, who has repeatedly stated that he only does work when it profits him somehow, tears up the French countryside to the point of exhaustion, looking for Tamaki's mother.
 * Later on in Chapter 78,.
 * Pretty much all of chapter 80, when everyone is working together to help Tamaki see his mother before she goes back to France.
 * The very end of chapter 80. ""
 * Near the end of the manga, Haruhi decides she needs to come clean to the rest of her classmates about being a girl. The Host Club throws a party, but Tamaki and Kyouya convince Haruhi to do things their way instead of just out and saying it, resulting in all of the club's customers getting together and telling Haruhi that they already knew, and they still support her and her relationship with Tamaki.
 * The last chapter then makes it hilarious and still kind of heartwarming - they didn't actually know Haruhi was a girl. They thought the "secret" was that Haruhi was a homosexual cross-dresser in love with Tamaki, and they accepted it wholeheartedly. Indications are that, while surprised by the truth, they're still not upset about it.
 * Chapter 83, the last chapter of the series. Where the Host Club.
 * And also the scene before it where Haruhi discovers that.

"Hikaru: Kaoru, we're twins. Isn't it an incredible gift? Normal people can only face their future alone; you and I can face it together. We aren't depending on each other. From now on, we'll influence each other; it would be good if we could stimulate each other. If we don't forget this, then, for sure, a future twice as fun as other people's awaits us!"
 * This picture.
 * There's plenty of "Aww" to go around near the last half of Chapter 53, especially this:


 * And complete with a bromantic Headbutt of Love.
 * A moment exclusive to the live action drama -- in episode 5, it's revealed near the end of the episode that Kyoya also dove into the water to save Haruhi and was the most concerned for her safety.
 * All of Tamaki and Haruhi's interactions as a couple, especially the one-shot where Haruhi looks at a sleeping Tamaki (He fell asleep waiting for her to finish her homework so they could watch a movie together). Her inner monologue where she expresses that Tamaki is not the only one who wants to make the relationship work and that she just doesn't know what to do is pretty d'awww worthy.
 * Not to talk about the book Tamaki was reading before he fell asleep:
 * The end of episode 18 ("Usa-chan, daisuki!"). And, for this Troper, the end of episode 20 with the perfect close on the title card "The Door the Twins Opened" was so heartwarming that it also became a Tear Jerker.
 * In the final bonus chapter, Tamaki finally gets his dream of having himself, his father, mother and grandmother all sitting together happily around a kotatsu. Then it flips over to silly when he realizes that when he marries Haruhi, he'll need a hexagon shaped one (to account for Haruhi and her father). All the while, his mother is wondering if she should just tell him that a long one would be fine.