Danbooru-based image board with a specialization in high-quality images.
cal_ruslan deep-blue_series elf elincie_yerthrop komatsu_e-ji myrsky_leanne pointy_ears prawla shirogane_no_cal_to_soukuu_no_joou thighhighs

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Writing equations in a girl's body?...

Well, whatever, Is this game related to the Tristia series?
It's called deep-blue series.