Looking it up, while this specific weapon is likely fictional, the Hypervelocity Anti-Tank Missile was a real anti-tank missile development program developing and serving as a test platform for the US Army's Compact Kinetic Energy Missile program. Raytheon had a test launch in 2002, and the test vehicle was 6 inch in diameter and 50 inches long, which apparently made it promising to be compatible with existing TOW tube launch systems.
Looking it up, while this specific weapon is likely fictional, the Hypervelocity Anti-Tank Missile was a real anti-tank missile development program developing and serving as a test platform for the US Army's Compact Kinetic Energy Missile program. Raytheon had a test launch in 2002, and the test vehicle was 6 inch in diameter and 50 inches long, which apparently made it promising to be compatible with existing TOW tube launch systems.
If you're talking about the LOSAT I'm aware of it, but the naming scheme in the commentary is more suggestive of the ATGM series in service with the Japanese army (87式対戦車誘導弾 Type 87 Chū-MAT, 79式対舟艇対戦車誘導弾 Type 79 Jyu-MAT, 64式対戦車誘導弾 Type 64 MAT).
If you're talking about the LOSAT I'm aware of it, [...]
Don't think that is the same thing, as this uses the term HATM and was a development program from 1996 to 2002 by Raytheon, Alliant Tech Systems, and NAMMO to develop a lightweight, compact, potentially low-cost missile that could reach speeds in excess of Mach 6.5 to defeat line-of-sight targets.
Changed parents for everything from this pixiv post, because for some reason the artist appears to have taken the twitter uploads and recompressed them, so these are inferior duplicates. The filesize and quality level of the jpgs are much higher but all the same artifacts are visible.
Players are intended to watch Chapter 62 of the main story before watching the story for this card. I have not been following the main story, but from what I learned from other sources, I believe the events are connected to Haruka moving overseas, resulting in her leaving the main cast and Ortensia going on hiatus indefinitely. This is because her current voice actress at the time was about to retire. Basically, this is Haruka's farewell party.
The absolute tonal whiplash between this and the 4*s makes me laugh. It took the decimation of Mizuki's perception for Mafuyu to come out with the happiest card in a set.