Ryuuji Kisaragi is an Ordinary High-School Student, living a peaceful life. Until his second cousin Eriko comes home from America, forcibly enlisting him in Seven Tails, her (unapproved) organization dedicated to hunting down Lost Precious, powerful artifacts from around the world. One of these artifacts is being traded that night, and she wants his help.After seizing the box with the artifact, the box opens to reveal a young girl (later named Rose) who's both attached to Ryuuji and able to throw fire. She is a dragon, and her very presence sets off a chain of events that will decide both Ryuuji and Rose's future.Based on a series of Light Novels, Dragon Crisis! was adapted into an anime in the winter of 2010/11.The anime can be viewed legally at Crunchyroll here.
Rose, towards Ryuuji, but in a totally adorable way. Rose gets jealous of Maruga when the latter mentions that they're not married, and gives Ryuuji a kiss (while blocking Rose's view of it with an umbrella) as thanks for him helping her resolve her issue in episode 5. Which then prompts Rose to repeatedly suggest they get married, giving poor Misaki another Heroic BSOD moment.
Evil Cannot Comprehend Good: The Ax-Crazy painter, who believes that all women are liars, even after the girls tell the truth to his questions (all of which involve Ryuuji in some way). Although they manage to escape, he's still convinced they're all liars, and tries to kill them anyway.
Friendly Enemy: Sapphie. The worst she does to the main characters is get them wet. Then later she "attacks" Rose, but only gets herself wet, and the next scene is at Ryuuji's apartment where Rose is helping dry her clothing, giving her a bath, and feeding her. Even when Rose is kidnapped, she helps out the main characters and never truly acts intentionally malicious towards them.
Healing Hands: A dragon's breath can heal humans, like when Rose heals Ryuji after their fight with Onyx.
Heel-Face Turn: Ai, after reading her master's thoughts that he actually kidnapped her and was merely using her as an experiment.
Sapphie seems to do this as well. Then again, she never really seemed evil in the first place, and actively tries to help Rose out.
Heroic BSOD: Misaki suffers one after hearing Rose mention being engaged to Ryuuji. It ticks her friend Mao off so much that she tries to hit Masato on the head during a watermelon smashing event at the beach.
Ryuuji seems to suffer this about halfway through episode 11. It takes Misaki and Maruga talking to him to snap him out of it.
Hopeless Suitor: Poor Misaki, it seems she never really had a chance with Ryuuji, since he was snatched up by his cousin within the first 5 minutes of being introduced, then Rose clings onto him before she ever gets an opportunity to express her feelings. It doesn't stop Mao from trying to hook them up however.
An Ice Person: Margarite, aka Maruga, as well as a wielder of the Ice Rage.
Idiot Ball: Ryuuji has the poor sense to believe everything Onyx says to him, regarding Rose's ailing health, so he helps Onyx to kidnap Rose. This happens despite he knows that Onyx is a lying douchebag and more importantly he didn't even try to ask help from Maruga.
If I Can't Have You: When Rose made it absolutely clear that she will never consent to being engaged to him, Onyx assumes his draconic form and proceeds to attack her and Ryuuji. He wanted the power boost he would get from the engagement contract. Ironically, he would have had better luck with his loyal subordinate Kai than with Rose, seeing as how the requirement for this particular magical contract is for both parties involved to TRUST each other.
Furumori who justifies his actions because he thought the society wanted him to perform dangerous experiments to merge Lost Precious items into human bodies. When a female friend of his got sick, he tried to get an item that would cure her, but was repeatedly denied by the society member who owned said item.
The Ax murderer/painter fits this as well, since after being cheated on, he feels all women are liars.
Mad Scientist: Tokura and Bianca. With Bianca, it only really fits in her introduction episode, what with firing a Ryuuji-seeking missile at him in a classroom, then having a giant robot attack him (which in a flashback apparently didn't work the first time either). After that, she more or less acts somewhat normal.
Making a Splash: Sapphie. She's so hilariously bad with her water-based powers that the best she's ever done is to drop a ball of water on someone's head. She's pretty obviously the Inept Mage as far as dragons go.
The Masquerade: Considering Bianca fired a bazooka in the middle of a classroom, and then smashed part of it with a giant robot, it's startling how few people seem to catch on. Misaki notices, but only after being sucked into a painting, seeing Rose shoot fire, watching Saphi sprout wings, and even then has to be told outright.
Father George, who is far too sweet and kind-hearted to ever be good dragon slayer.
Ryuuji too. He even stops a guard from hitting Ai with a nightstick, even though she was stealing stuff at the time. In fact, almost every main girl is attracted to him due to this trope, with the exception of his cousin.
Nuns Are Mikos In a broad sense, anyway. The business with George and the sword and the mysteriously crossless church doesn't actually fit very well into major Christian denominations, but does seem to match depictions of Shinto tropes.
Official Couple: Rose and Ryuuji, but the end of the anime hints that the other girls aren't going to give up that easily.
Onion Tears: Episode 10 starts with Ai, Rose, and Misaki all crying because they're chopping onions.
Pretty Freeloader: Rose for the most part. Eriko sometimes, although she does drive Ryuuji around once in a while too. Interestingly enough for a harem anime, it's averted for every other main girl, as they have their own places to live, although they do show up at his apartment from time to time.
Really 700 Years Old: Maruga and Onyx. Maruga knew her uncle, who died a hundred years ago, so she has to be over a hundred years old despite appearing to be in her late teens/early twenties. Onyx and Maruga were childhood friends so he has to be over a hundred as well.
Supporting Harem: Rose and Ryuuji are "engaged", magically and otherwise. The rest of the harem does stand a fighting chance, but none of them live with him.
Tempting Fate: When the girls escape from the painting in episode 9, Eriko comments that if this was like a horror movie, something bad should happen next. Cue the Ax-Crazy murderer escaping into their bathroom mirror.
Tickle Torture: Eriko uses this on a captured Ai to get her to find out more about her.
The Power of Love: dragon "engagements" require both parties to trust each other completely and have feelings for each other, and give both a massive temporary boost in magical power. At one point this power was even used directly to disintegrate Onyx.
The Reveal: Ryuuji is a Lost Precious. Later subverted because, Fang lied.
Those Two Guys: More like that one guy and girl, but Masato and Mao, Ryuuji and Misaki's school friends, are this.
Title Drop: Onyx says that Ryuuji is a Dragon Crisis. He lied.