Sekai-ichi Hatsukoi ~Onodera Ritsu no Baai 10~ (世界一初恋 〜小野寺律の場合10〜), alternatively The World's Greatest First Love: The Case of Ritsu Onodera 10, is the tenth volume of the Sekai-ichi Hatsukoi manga series.
- The Case of Ritsu Onodera No. 18
- The Case of Ritsu Onodera No. 19
- The Case of Shouta Kisa No. 7
- The Case of Shouta Kisa No. 7.5
In "The Case of Ritsu Onodera No.18," Ritsu questions his family's expectations what a future with Takano would be like. Ritsu's mother calls him at work, upset that An Kohinata has canceled the engagement herself, leaving Ritsu distracted at work while he considers things. Takano is still intent on having meals with Ritsu, and the two end up going to Usaway (Subway). Arata Haitani calls Ritsu, and Takano tells Ritsu to stay away from him and finally tells him what happened at Shuudansha. Ritsu tells Takano that his engagement is formally over. They go back to Takano's apartment and have sex, and Takano is more gentle than unusual. The next morning, Ritsu says that he doesn't know what two guys would do together, but Takano says they'd be lovey-dovey and he'd spoil Ritsu rotten.
In "The Case of Ritsu Onodera No.19," Ritsu needs to make a scene more lovey-dovey and he learns more about Takano's past with Haitani. While researching the problem scene, he runs into Saeki and they go for dinner. While getting her a cab, he runs into Haitani, and they share a cab back. Haitani tells Ritsu more about what happened with Takano at Shuudansha. Takano sees Ritsu get out of the cab with Haitani, and he explains what happened more fully that Haitani seduced Takano's girlfriend out of revenge and he's worried he'll try the same with Ritsu. Ritsu later gives his author advice on fixing the scene, drawing from what Takano shared with him.
|Sekai-ichi Hatsukoi manga series|