- Author: 乙一?OtsuichiAuthor Record # 127731
- Legal Name: 安達 寛高?Adachi, Hirotaka
- Birthplace: Fukuoka, Japan
- Birthdate: 21 October 1978
- Language: Japanese
- Webpages: Wikipedia-EN, Wikipedia-JA
- Used These Alternate Names: Otsu-ichi, Otsuichi
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Fiction Series
- サマーゴースト / Summer Ghost
- 1
サマーゴースト?Samā Gōsuto(2021) with Loundraw
- 2
一ノ瀬ユウナが浮いている?Ichinose Yūna ga uite iru(2021)
- 1
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夏と花火と私の死体?Natsu to hanabi to watashi no shitai(2000)
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きみにしか聞こえない?Kimi no Shika Kikoenai(2001)
- Zoo (2003)
- Goth [English] (2015) [only as by Otsuichi]
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優子?Yūko(1996)
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夏と花火と私の死体?Natsu to hanabi to watashi no shitai(1996)
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カザリとヨーコ?Kazari to yōko(1998)
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血液を探せ！?Ketsueki wo sagase!(1999)
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暗黒童話?Ankoku dōwa(2001)
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神の言葉?Kami no kotoba(2001)
- Closet (2001)
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きみにしか聞こえない?Kimi ni Shika Kikoenai(2001)
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傷?Kizu(2001)
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華歌?Hana Ka(2001)
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SO-far そ・ふぁー?SO-far So-fā(2001)
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むかし夕日の公園で?Mukashi yūhi no kōen de(2001)
- Seven Rooms (2002)
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冷たい森の白い家?Tsumetai mori no shiroi ie(2002)
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陽だまりの詩?Hidamari no uta(2002)
- Zoo (2002)
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落ちる飛行機の中で?Ochiru hikōki no naka de(2003)
- Dog [English] (2015) [only as by Otsuichi]
- Goth [English] (2015) [only as by Otsuichi]
- Grave [English] (2015) [only as by Otsuichi]
- Memory/Twins [English] (2015) [only as by Otsuichi]
- Morino's Souvenir Photo [English] (2015) [only as by Otsuichi]
- Voice [English] (2015) [only as by Otsuichi]
- Wrist-Cut [English] (2015) [only as by Otsuichi]
- Afterword 1: From Boku No Sho [English] (2015) [only as by Otsuichi]
- Afterword 1: From Yoru No Sho [English] (2015) [only as by Otsuichi]