"Aki Edamatsu" is apparently an alternate pen name of Kuroko Yabuguchi (薮口黒子).  Her home page is PIT (Japanese only).

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The Final Day

ＴＨＥ　 ＦＩＮＡＬ　 ＤＡＹ リイド社： ＳＰコミックス・ ホラーウーピーコミックシリーズ 新書版	The Final Day Leed Sha:  SP Comics - Horror WooPee Comic Series Shinsho-ban
ISBN-10:4-8458-1620-2, 04/2000

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Other Works:

According to some sources, Edamatsu did the art for Kinzo Sakura (桜金造)’s Sesuji no Kooru Hanashi:  Kurayami no Elevator (背筋の凍る話　 暗闇のエレベーター), also published by Leed Sha under SP Comics - SP Pocket Series.

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