Here's a copy of the game with partial translation.
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I'm a translator and I'm thinking of finishing the work of turning the translation from partial to full. As far as I can tell the two main work items for finishing this translation are:
1. Change the recollection room events to be in English just like in the main story (not that difficult).
2. Translate the Free Battle powered up bosses' loss scenes, which is basically the same boss bullying the other heroine that they didn't bully in the main story, either Ryiru or Yae, and the overall flow of the scene is similar but Ryiru and Yae respond differently so that needs to be captured faithfully in translation (somewhat difficult).