Ep. 4: Yoriko returns to reveal secrets while Hastur arrives on Earth seeking help for his father.
Aired on May 1, 2012

Mahiro's mother, Yoriko, returns and encounters Nyaruko and Kuuko at their location. She subsequently reveals a secret to her son, Mahiro, during this reunion. In a separate development, a young boy named Hastur, also known as Hasuta, travels to Earth. He arrives with the specific intention of finding an individual who can assist his father. The reasons behind his father's need for help remain unknown at this time. This sequence of events introduces new interpersonal dynamics between Mahiro and his mother while simultaneously establishing Hastur's mysterious mission on Earth.
Episodes
- Ep. 1 · Mahiro Yasaka is protected by Nyarlathotep who moves in as his relative and wife.
- Ep. 2 · Nyaruko confronts rivals in R'lyeh and returns to Mahiro after a dimensional battle.
- Ep. 3 · Mahiro faces Nyaruko's advances, Kuuko's arrival, and Nyaruo's failed nightgaunt revenge.
- Ep. 4 · Yoriko returns to reveal secrets while Hastur arrives on Earth seeking help for his father.
- Ep. 5 · Mahiro and Hasuta travel to R'lyeh to rescue Yoriko and Kuuko from a mysterious kidnapper.
- Ep. 6 · Nyaruko fights Kuuko while Mahiro discovers his mother was kidnapped for her gaming expertise.
- Ep. 7 · Nyaruko receives permission to date Mahiro but faces rejection after being too clingy.
- Ep. 8 · Mahiro Trapped in a Dating Sim After Nyaruko's Confession