Masumi Kamuro

Appearance
Masumi has thigh-length purple hair that is tied in a long ponytail on the right side with bangs to the right side and purple eyes.

She is mostly seen wearing a standard female school uniform.

Personality
Masumi is a very honest and loyal girl who hasn't done any damage to the interests of the class. She is close with Arisu Sakayanagi, and willingly follows her orders. She is known to be a shoplifter.

Plot
Masumi was first seen walking with Arisu Sakayanagi in the school's back alley while holding an umbrella for her.

Later, on the school cruise ship she was seen at the 4-star restaurant, along with several other students who are presumably from Class 1-A, as they were staring at one of the students from Class 1-D, who grabbed another student from A-class, who started mocking them because of being in the lower class.

She was also the one on the phone with Arisu, as the latter was seen to be setting the school trip out, due to her illness, playing chess at the library. Arisu then asked Masumi to investigate some students for her.

in Volume 6, Sakayanagi can be seen teasing Kamuro and also indicates that Kamuro is ordered to monitor Kōhei Katsuragi but after he withdrew from the contest of leadership for Class-A Sakayanagi ordered Kamuro to monitor Ayanokōji next.

In Volume 7.5 Kamuro searches for Sakayanagi and finds her having a chat with Ayanokōji at the mall. Upon meeting them, Sakayanagi asked Kamuro about her thoughts on Honami Ichinose, to which she replied that she thought Honami was an honors student, however, Sakayanagi told her that Honami had the same problem as her. Since Kamuro's evaluation of Honami was high she didn't believe that, but later, Sakayanagi asked Kamuro why she hadn't asked the reason that Sakayanagi was discussing strategies with Ayanokōji which she found suspicious.



In Volume 9, she told Ayanokōji how she had met Sakayanagi. A week after the entrance ceremony, Kamuro had just left a convenience store when she met Sakayanagi. Sakayanagi accompanied her upon leaving and then asked her if she had been shoplifting. Even though Kamuro denied it, Sakayanagi continued her inductive reasoning towards Kamuro's action due to which she could not deny anymore and pulled out the can of beer that she had stolen. Observing the current situation she told Sakayanagi to just report her action to the school but Sakayanagi rejected it and told Kamuro that she had grown to like her, and asked her to be her first friend. She then said that in return for some favors, she would turn a blind eye to Kamuro's shoplifting that time and in future instances as well. Sakayangi told Kamuro that her instructions would be anything but boring and can replace the thrill Kamuro found in shoplifting. Later, it is revealed by Ayanokōji in his reasoning that Kamuro was used by Sakayanagi to lure him to take action to save Ichinose by telling him about what Kamuro and Ichinose both had earlier done. .

In 2nd year volume 9.5, Masayoshi called her to talk with her about something. Masumi was annoyed to talk with Masayoshi and even more annoyed that he called her Masumi-chan. Masayoshi said what he heard from students of Suzune's class said about Kiyotaka. Masumi said she know about some of it and rest of it is new and interesting to her. When Masayoshi said Kiyotaka's abilities surprassess Arisu's Masumi said Is he sure to which Masayoshi said he is not going to add probably or possibly because he is sure. Masayoshi asked Masumi to investiage about Kiyotaka which she accept but she said not call her Masumi-chan anymore and she is going to talk alone. Masumi found Kiyotaka with Hiyori and interrougated him that she saw him go out with Kei in 29 December and said Is he now going out with other girl and some funny things. Kiyotaka and Hiyori gave a little explanation about what happened. Masumi then asked about what did Kiyotaka do with his recent activities, Kiyotaka did not know what she was talking about and Masumi said she know Kiyotaka is snopping around A-class. Kiyotaka remembered a student of Class-A asked him something and brought it up and it seems like caused misunderstanding. Then Masumi wanted to ask about Kiyotaka being mastermind but Masayoshi and Hayato appeared and Masumi gave and expression that she saw someone she did not want. When Masayoshi said the stupid thing that when he sees Kiyotaka with beautiful women the flames of jealousy burns inside of him. Masumi wanted to leave, but Masayoshi stopped her. Then they decided to find a place to talk because Kiyotaka did not wanted to attract unnecssary attention. Masayoshi said typically karaoke would be good but Masumi turn it down. Hayato said the reason of that is because Masumi is tone-deaf which angered Masumi. Hayato also said Masumi has the demon ears which she heard again. When Masayoshi was hitting on Hiyori, Masumi wanted to stop him, Masayoshi said then does she want to become his girlfriend which got Masayoshi a kick. When they got to a cafe Masayoshi asked another funny question from Kiyotaka which caused Masumi to kick him again. When Kiyotaka gave the answer that he is the mastermind behind Suzune, Masayoshi asked Masumi what does Masumi think which she said almost certain but not quite. Masumi questioned Masayoshi when he said Arisu will welcome Kiyotaka to her class. Masumi asked Masayoshi Is he sure which he said after asking the reason Masayoshi said first he wants Kiyotaka to answer when he gave the answer, Masayoshi wanted to move next stage but Masumi got up to leave. Masayoshi tried to stop her but she got out so Masayoshi went out to find her.

Name Etymology

 * The name Masumi consists of kanjis that mean "real, genuine" (真) (ma) and "clear, pure" (澄) (sumi).
 * Masumi's surname Kamuro consists of kanjis that mean "god, deity" (神) (ka) and "room, greenhouse/icehouse, cellar" (室) (muro).

Trivia

 * Masumi shares the same student identification number with Mio Ibuki.
 * For the 2nd Year arc, When asked about her aspirations for the next year, Masumi answered  'Not really... If I have to say something, to look after that girl who easily goes astray, perhaps? Sounds stupid though.'