GARO - Season 1 Episode 17 Tank

After telling Gonza about what Amon told him about a means to save Kaoru, still hiding the truth from the girl as he promised to protect her, Kouga learns that a Horror named Haru appeared. Entering the body of a goldfish, Haru takes advantage of a man named Tonuma to have him feed it women in order to assimulate their features to gain a human-like appearance. After being unable to find the Horror, Kouga is forced to use Kaoru as bait. But temporary halted by the other Horrors attracted to Kaoru, Kouga is barely able to get to her in time as she was about to be fed to Haru. Kouga shatters the glass with the incomplete Horror revealed as it is breathing heavily before beheading Haru and restraining himself from killing Tonuma. However Haru's head reveals Kouga's intention for Kaoru as Horror bait in its dying breath, with a heart-broken Kaoru running off.