The young woman you have in front of you is Black Knight and we find her in Bikini Warriors. She may wear a swimsuit to protect her body, but she still has a huge ax, helmet and leggings. It is also possible to remove her top, but if you want more, you will have to opt for the Limited version. It also contains episode 19 in OVA Blu-ray of four minutes, an A4 cover and an illustration of Akira. So, convinced?