An army of police confronts the Valkyria for questioning, provoking her to unleash her antimatter magic that erupts the mountain. Having the citizens devastated of the explosion, one of the witches, Hatsuna Wakabayashi, recovers from her wounds thanks to her regeneration ability and freed away. Looking up on what happened, the girls tell Ryota that Valkyria is an ultimate witch with many types of magic. Despite that fighting Valkyria is out of their league, they think of any strategy to avoid her. Hatsuna who overheard Valkyria has detected the witches at an observatory searches for them. She finds the club members faking their deaths as to protect themselves. Hatsuna is welcome to the astronomy club and goes to wash at the onsen. The girls tell Hatsuna how reliable Ryota is. Testing if he really is trustworthy, she pretends to be helplessly struck on a radio tower and calls Ryota to get her. She deliberately slips off and Ryota grabs her. Refusing to let go, even though she plead her regeneration power, Ryota swings her back onto the tower but sends him falling to the ground. Luckily, Kotori saves him, at which point reliefs Hatsuna. Touch of Ryota's actions, Hatsuna bluntly confess and kisses him in front of the others, incited Neko to blast down the tower in jealous rage. Later, Kogoro calls in Ryota with a theory that the witches' melting is based on a digestive enzyme: protease. Using a thesis that he learned from a man (Chisato) in college, it's possible to shorten the time of producing the medicine, however it will still take a month. Mako Fujisaki the Valkyria is sightseeing when Chisato appears to her. Revealing to have unrequited feelings for him, Chisato requests Mako to bring him to where #1107 is. Ryota returns with the good & bad news, although there a possibility for one of the witches can survive, but unwilling to sacrifice anyone. Kotori carries some juices then accidentally spills them on Neko. Exposing her chest, Ryota discovers the moles on her breast and re-familiarize that she is Kuroneko. Crying in tears of joy, Ryota reconciles with Neko that he will help fill in her empty memories. Then a helicopter is coming their way, before they can flee, Mako appears to them who to Ryota looks identical to Neko.