|Ill Tempered Triangle|
|Rōmaji||Fukigen na toraianguru|
|Air Date||August 9, 2008|
|Previous||Enviable New Face|
|Episode||Itazura na Kiss #18|
|Next||CRAZY FOR YOU|
|Manga||Chapter 57, Chapter 58|
|Animation Director||Otoo Takuma|
|Opening||Kimi, Meguru, Boku|
|Ending||Jikan yo Tomare|
Ill Tempered Triangle (不機嫌なトライアングル Fukigen na toraianguru) is the eighteenth episode of the Itazura na Kiss anime, which aired on August 9, 2008.
Irie starts to ignore Kotoko due to being overly jealous of Keita. During lunch one day, Chris gets burned by oil, and Kinnosuke, refusing to hand her over to anyone else, admits his feelings and devotion and proposes to Chris. Chris, after some persuasion due to insecurity, accepts. When Kotoko gets very fed-up of his behaviour she gets very upset and starts throwing books at him and saying that Keita was right Irie doesn't care about her and that Keita thinks about her more than Irie does and that Keita was serious, Irie slaps Kotoko, Kotoko yells that she's had enough and runs away, she ends up at Tomoko's house. Kotoko's dad talks to Irie about how things had been between him and Kotoko's late mother. The next day in the lunch room Keita talks to Kotoko asking her to live with him now that she's run away from home, when Kotoko declines Keita confesses that he is in love with Kotoko, and she should not go back to someone who does not love her, Kotoko tries to defend Irie but Keita questions if Irie came after her, and just as Kotoko is feeling like Keita is right, Irie runs in claiming Keita is wrong and that he was only being the way he was because he was feeling jealous of Keita, explaining that he (Irie) has never felt jealous or sad before so he didn't know what to do, he confesses that he can work through it all with Kotoko by his side, Kotoko still teary, questions Irie if it's ok for her to be by his side, Irie smiles at her saying that's what he wants, Kotoko runs to him and hugs him, the whole school breaks into cheers and congratulates them. And Keita walks out admitting defeat. Later, Irie is seen kissing Kotoko in their bedroom.