This is the same plot that doskoinpo did in April and that Akazawa Red probably started, the "hero who already beat maou lets his guard down around flirty succubi, gets level drained, and ends up panicked and terrified before becoming livestock or killed" scenario. But I can't help but love it, especially how every mangaka's interpretation differs.
This one has two major types of succubi, normal ones and weaker less curvy ones (wish they'd received character data) plus a siren for support. No wonder the title calls it an "army". As always the last page or two of these stories is what I look forward to the most. And I wasn't disappointed, it was a nice touch how those succubi had longer hair, no doubt they're on their way to becoming powerhouses.