"Panahon ng Hapon" is a Tagalog horror animation set during the Japanese occupation of the Philippines in World War II, weaving together themes of fear, survival, and the supernatural. The story follows Lola Rosa, an elderly woman living in a small village that faces both the threats of war and the lurking danger of an aswang.

As tensions rise with the arrival of Japanese soldiers, villagers share tales of an aswang that prowls the area, preying on the vulnerable, particularly women and children. Lola Rosa, known for her herbal remedies and wisdom, becomes increasingly worried as she hears reports of missing villagers and strange occurrences at night.

One evening, while tending to her garden, Lola Rosa encounters the aswang, disguised as a local villager. Sensing the creature’s true nature, she uses her knowledge of traditional remedies and charms to protect herself. As the aswang's attacks escalate, Lola Rosa must rally the villagers to confront the creature and reclaim their safety, even as they face the horrors of war.

The climax of the story features a tense showdown between Lola Rosa and the aswang, highlighting her bravery and resourcefulness.

"Panahon ng Hapon" combines elements of history with Filipino folklore, emphasizing the resilience of the human spirit in the face of both war and supernatural threats. The animation serves as a poignant reminder of the struggles endured during this tumultuous period while exploring the rich cultural beliefs surrounding aswangs.