Hello, today we have the final chapter of Volume 11 for you. Edit: Volume 11 batch link added.

Volume 11 Special 2

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Kazuya and Kiriha go to the school at night to deal with an abberation. This chapter was a promotional one-off that ran in a magazine while Tsugumomo was still a web comic. The afterword at the end of the volume is also included.

Volume 11 Complete

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And here’s the complete volume.