So, is the only reason I can see through to Sayaka's skirt because the slide has been pulled back (which normally chambers a round from the spring-loaded magazine) and there's no magazine in the gun?
I wonder how much gun research Hiro Suzuhira had to do to make the CGs for Soul Link. More than usual, it seems.
If there is no magazine in a regular semi automatic pistol then it is possible to see from the ejection port though the bottom of the handle since it's all empty space.
Only thing I would complain about is that the ejection port is too short, and the ejection port should have also moved forward on the slide. He also made the barrel a little longer than necessary, assuming it's a regular length Glock pistol, like a 17, 21, or 22.
I see. Any Glock-type pistols with barrels long enough to fit this picture? Maybe the 20C, chambered for the rare but more powerful 10 mm round?
So, the way to get the + 1 designation in ammo capacity is to pull the slide back by hand ("manually"), then put a single bullet inside, then put a full magazine in to get one more bullet to use than one you would normally?
Better to insert the magazine, chamber a round, then eject the magazine and load another round into it. Autos can be sensitive on how the round is loaded, and it's better to allow the firearm to be used in the designed fashion. Also, dropping the slide on a manually chambered round causes excessive wear on parts, especially the extractor as it slams into and is then forced to ride over the case rim. This is of special interest with Glock pistols (which the Soul Link guns appeared to be), as they can fire "out of battery", i.e. without the side fully closed. Search "Glock KaBOOM" for the results thereof.
It's mostly the size of the ejection that looks strange, but the protagonist is also holding the gun in his left hand and sort of, um, "stroking it affectionately" with his right, because the position of his fingers is certainly not conducive to racking the slide.