It stars Kohaku from Tsukihime and features characters from various Type-Moon series. It is drawn in a chibi style, and it is a self-aware series that constantly breaks the fourth wall.
Carnival Phantasm included segments based on the series, and it was the focus of Type-Moon's 2012 April Fools' Day joke. Several characters from Koha-Ace have been made into Servants in Fate/Grand Order.
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