Yeah 4chan keeps telling me
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Here's vols 3 through 5 of piko piko as .epub files
https://pixeldrain.com/l/eWZYZTUp
I found them by searching on anna's archive:
https://annas-archive.gl/search?q=新世紀エヴァンゲリオン+ピコピコ中学生伝説