Arc 4A Month Beneath the Moon
After losing some of his memories, Sera arrived on The Blue and became Herta’s research subject and assistant, growing close to her as they built a puppet and shared time together. When Sera revealed he had only one day left before returning, he and Herta spent it at the lantern festival and promised to meet again.
- Sera awoke on The Blue and agreed to become Herta’s test subject, while she discovered that his Authority of Corruption could affect machines and space.
- Sera followed a message from Cyrene to stay with Herta, studied alongside her, and helped build No. 0 and 300 Herta Puppets.
- Herta took Sera to an amusement park, where they watched fireworks together and began recognizing their feelings for each other.
- Sera and Herta agreed to be together, and he showed her his Herrscher form before they conducted experiments and cooked together.
- Sera, Herta, and No. 0 went camping, where Sera gave Herta an everlasting purple bellflower and they shared a quiet night watching anime beneath the moon.
- Herta designed festival clothes for herself and Sera, while Sera prepared for the lantern festival and considered what he could leave behind after returning.
- Sera and Herta attended the Qixi festival, made qiaoguo and blessing plaques, took photos, and held hands as they explored the stalls.
- Sera and Herta released their sky lanterns, and Herta revealed her wish through fireworks as Sera promised they would reunite across time, space, and causality.
- Sera told Herta he had one day left, and they spent the remaining festival hours rowing together beneath the river and sky lanterns.