Groups
- masmenos 3
- maso pink 3
- masurao 3
- material company 3
- material mel 3
- matsuge club 3
- matsuri furi 3
- matsuya 3
- matsuzou honpo 3
- mattari gozen 3
- mattete hototogisu 3
- mattsuaya 3
- mawaru tsukito usagi 3
- mayu tomato 3
- mebi-ken 3
- mecca 3
- meco 3
- mega ant 3
- mega heart ski 3
- megacycle13 3
- megaki 3
- megami no tamago 3
- megamouthsystem 3
- megane beam 3
- megaromance 3
- megusurinoki 3
- meitei works 3
- meiteitei. 3
- mellowmate 3
- melon 3
- melonlime 3
- melty cherry 3
- mememacho 3
- menndokoro 3
- mercator zuhou all-grio 3
- mercure akamiche 3
- mercurius 3
- mermerry 3
- merril 3
- meru 3
- merumeru dan 3
- mesechina 3
- mesuman toruko teikoku 3
- mesuochi-tei 3
- metako 3
- metal box 3
- metal-egg 3
- metalize 3
- metronome 3
- mew and siren 3