[Machine Translation] Trapped in the void by the Serpo aliens who appear on campus, Okarn is once again targeted by the symbol of a man. However, just as he is about to doom himself to death, a girl in love, Aira, awakens the power of the Akurosura flame that resides in her body. She joins forces with Momo and a fierce battle ensues, while the Serpo aliens merge with the formidable Dover Demon and Nessie! Can the Okaruns, who have joined forces to face the repeated crises, defeat the Serpo aliens? This is the fourth volume of the mysterious battles and sweet and sour love story!