Danbooru-based image board with a specialization in high-quality images.
honmachi_keisuke seitenshi_yumiel sword wallpaper

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本町圭祐: honmachi_keisuke vs motomachi_keisuke.
ErogameSpace uses honmachi_keisuke, and dmm uses the latter.
(His own site seems down)
Since this wallpaer is offical material, I prefer honmachi_keisuke.