Konosuba: An Explosion on This Wonderful World!, Vol. 1 / この素晴らしい世界に爆焔を！Volume 1 English version pre-order is currently on Book Walker. The light novel series is a prequel about Megumin before Kazuma and Aqua appears. Campaign includes an exclusive wallpaper featuring the Crimson Demon Clan girls. Price is $8.36 or ¥860 until December 31. For more details, check out the campaign page.
Book Walker: https://global.bookwalker.jp/select/71/
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