[ENG Ver.] Master Inventor Kain ~Operation Squirting Cheeky Girls~

Editorial Review

★3.8 / 5 — henhenta editorial rating (our own assessment, not the DLsite official user score)

Master Inventor Kain sits in the comedic sci-fi corner of the “cheeky girl comeuppance” subgenre, where a smug, dismissive heroine is humbled by an absurd gimmick. Most entries in this space rely on a straightforward dominance setup, so the mad-inventor framing here, with Kain’s “orgasm beam” and her self-styled “operation,” gives the premise a playful, almost tokusatsu-flavored energy.

What distinguishes the work is the care put into its setup and structure. Hinode Asahi, a member of the cool group who coldly shuns her former best friend Fukaya Yonaka, gives the story a small social-dynamics hook. That is more than the usual brat archetype gets, and it suggests the humbling carries some emotional charge. The “sex menu” is also unusually explicit about its design: sensation-sharing squirting, restraint fingering, a womb tattoo scenario with a left-alone setup, and a high-speed finale, with the promise that every scenario includes squirting. The restraint theme runs through the whole thing, including an electric massager scene, so the tag combination of restraint, continuous orgasms, and squirting is consistently delivered rather than sprinkled in. At 67 monochrome pages, with sex starting on page 7, the pacing is front-loaded and efficient, and the full-color cover and afterword add some polish. The JPEG and PDF formats and the official English version make it easy to read.

Readers who enjoy squirting-centered, restraint-heavy material with a lighthearted sci-fi conceit, and who like a bit of friendship tension behind the cheekiness, will get the most from it.

Verdict: A focused, gimmick-driven showcase for squirting and restraint fans that gives its brat-punishment formula a fun inventor twist.