2016, Comedy, English Subbed, Ep 1, hai to gensou no grimgar special, Hai to Gensou no Grimgar Special ep 1, Hai to Gensou no Grimgar Special Episode 1, Special, 灰と幻想のグリムガル 「風呂の壁にかけた青春――one more センチメートル」
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Episode 2.5 of the series, will expand on the ending of episode 2.
Included in the 1st volume of the Blu-ray/DVD releases.