Ran Musen is a main character in the non-yuri series R-15. A genius programmer. With her skills she is able to hack into government satellites and computers. Ran's hacking abilities are so superior that she can hack anything. Her name means "wireless LAN".
- She is lesbian because she is shown to be only interested in girls.
- She dislikes the protagonist Taketo Akutagawa and constantly blames negative occurrences on him before getting violent, and looks down on him the most out of all the students.
- Had a taste of Fukune.
- Have sleepovers with numerous girls.