In Danganronpa: Trigger Happy Havoc, all three boys were participants of the Killing School Life. However, each of them ended up dying by the end of Chapter 2.
At the beginning of Chapter 3, the remaining students all investigate the third floor of the school, which had just become accessible to them. While looking around in the repository, Makoto Naegi finds a picture of Chihiro, Leon and Mondo laughing together, which obviously confuses him. It is later revealed that this picture had been taken two years earlier, back when they had all attended Hope's Peak Academy. This suggests that Chihiro, Leon and Mondo were all good friends with each other during their school time in Class 78th.
While the game suggests a friendship between the three, this is contrasted in the official artbook, with Leon and Mondo being shown to think negatively of each other on their relationship charts. Mondo believes Leon is a moron, while Leon thinks Mondo's style doesn't make him look popular. However, Chihiro is shown to think positively of both of them, saying that Leon has a lot of confidence, and that Mondo is pretty cool.
The ship mainly sailed after the photo of them was discovered in Chapter 3. This lead some fans to come up with their own theories about what their relationship was like before the Tragedy. This discovery is also what likely lead to the creation of the ships Chileon and Mondoleon, as Leon had never previously been shown to be overly close with Chihiro or Mondo.
While there are some who like the ship, it tends to be overlooked in favor of Chishimondo, a much more popular poly ship that involves Chihiro and Mondo.
- Fujisaki Chihiro & Kuwata Leon & Oowada Mondo tag on AO3
- Fujisaki Chihiro/Kuwata Leon/Oowada Mondo tag on AO3
- All three characters died back-to-back during the Killing School Life.
- Chileon refers to the ship between Chihiro and Leon
- Chimondo refers to the ship between Chihiro and Mondo
- Mondoleon refers to the ship between Leon and Mondo