As well as her manga series, Touma Kaori also illustrates the Cobalt novel series Tokyo S Kibi Tanteidan, which is written by Hibikino Kana. It has 25 volumes out.  It's about a detective agency with uncommon high school students.  I read the first one for a Japanese project, and it was hard.  I have up to Volume 7, but it's going to be a long time before I try reading another one.

Volume 1 Shoujotachi wa Juujika o Seou ISBN4-08-614551-0	Volume 2 Aoi no Fuuin ISBN4-08-614562-6	Volume 3 K no Shokeiba ISBN4-08-614597-9	Volume 4 Itsuki, Rachirareru ISBN4-08-614629-0
Volume 5 Saraba Aishiki Hito yo ISBN4-08-614654-1	Volume 6 Hitsujitachi no Saidan ISBN4-08-614681-9	Volume 7 Chikurin Onsen Satsujin Jiken ISBN4-08-614691-6	Volume 8 Tokeidai no Kubikukuri no Kane ISBN4-08-614724-6
Volume 9 Mato ni Naku Ryuu ISBN4-08-614757-2	Volume 10 Kimi ni Sasageru Hanataba ISBN4-08-614782-3	Volume 11 S no Souretsu ISBN4-08-614814-5	Volume 12 Oretachi wa Tenshi Ja Nai ISBN4-08-614863-3
Volume 13 Rome no ??hi ISBN4-08-614891-9	Volume 14 Takarajima e Youkoso ISBN4-08-600028-8	Volume 15 Singing Bird ISBN4-08-600066-0	Volume 16 Okusama wa Majo!? ISBN4-08-600114-4
Volume 17 Hokenshitsu to Machine Gun ISBN4-08-600117-9	Volume 18 Arashi no Uta o Kike ISBN4-08-600145-4	Volume 19 Sono Onna, Kyobou ni Tsuki ISBN4-08-600229-9	Volume 20 Hachigatsu no Ame ISBN4-08-600260-4
Volume 21 U no Rakuin ISBN4-08-600299-X	Volume 22 Motto Kikenna Game ISBN4-08-600350-3	Volume 23 Bacouple ga Ippai ISBN4-08-600388-0	Volume 24 Ame no Umi ni Nemure ISBN4-08-600418-6
Volume 25 S Kibi, Kaisan!? ISBN4-08-600460-7

 
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