Groups
- masters of ero 1
- masuda gunkou 2
- masudaya 2
- masukawa 2
- masulao maximum 11
- masumasu soul gorilla 8
- masumi pan koubou 4
- masuraion. 8
- masuraion. 5
- masurao 3
- masuraojisan 6
- masys 1
- mat 13
- mata ashita. 120
- mata ashita. 47
- mataatode 1
- matagitei 27
- matango honten 2
- mataro 58
- matatabi sanjou 20
- matatabi spray 1
- matatabi zouen 1
- matazure tengoku 33
- match hakase 8
- matcha pink factory 1
- maten 7
- matenrou 1
- matenrou sougetsu 2
- matenrou wine 2
- material 11
- material company 3
- material engine 4
- material girl 1
- material mel 3
- matilda 13
- matilda kanmidokoro 4
- matine 14
- matinee 8 1
- matrix 1
- matsubara shougakkou 1
- matsubaya corporation 1
- matsucha. 26
- matsucha. 6
- matsuda shin 28
- matsugaoka yougisha 2
- matsuge antenna 57
- matsuge club 3
- matsuhana 1
- matsukaze 1
- matsukichien 1