Publisher / Manufacturer
- Aka Sick Library
- Ake
- Aketa
- Akia
- Akiba Shobo
- Akio Nagasawa Publishing
- Akita Publishing Co.,Ltd.
- Akita Shoten
- Akitasakigakeshimposha
- Akiyamakobo
- AKROS
- Aku Ri Comic
- Aladdin X
- Alan Corporation
- ALBA
- Albatros
- Albatros
- Albatros
- Albatros Film
- ALBA出版企画部
- Alchemist
- Alclad
- Alcoilis Records
- Alfa Record
- AlfaSystem
- Algernon Product
- Algonquins
- Alice Glint
- Alice Japan
- ALL-WAYS
- Alliance Arts
- Allman
- Allmix
- ALM RECORDS、コジマ録音
- Almond Shoseki
- ALPHA
- ALPHA
- Alpha Enterprise
- Alpha Satellite
- ALPHA x OMEGA
- Alphamax
- Alphax
- Alter
- althi
- Altron
- ALUMINA
- ALUMINA
- Amada Printing
- Amahoro-Music
- Amami Sha
- Amayakan Japan
- Amazia
- Amedia
- american mussle
- AMG Shuppan
- AMGエンタテインメント(株)
- amiami
- Amiami x AniGame
- Amiami x Snail Shell
- amiamizero
- amie
- amie slash
- AMIEGURAN
- Amigo
- amisports
- AMITA
- AMS
- AMT
- amtech
- Amukomi
- AMULET
- AMUSE
- Amuse soft Entertainment
- Amuse Video
- Amuze D.C.R.
- An Knockout
- AN Records
- ANDBOOK
- Ando
- ANDO
- ANF Corporation
- Angei Seisakusho
- Angeles〕 Alfred Publishing
- ANICRAFT
- Aniera
- AniGame
- AniGame
- AniGame x Reverse Studio
- AniGift
- AniGift x AniGame
- Animac
- Animate Film
- Anime Bank
- Animenixe
- Animester
- ANIPLEX
- ANIPLUS
- AniTone Music
- Aniware
- annulus