Mermaid vs Lamia!

"Mermaid vs Lamia!" is the 12th Chapter of "Daily Life With A Monster Girl" or "Monster Musume no Iru Nichijou".

Plot
The story continues from Chapter 10, with Meroune Lorelei beginning to settle into the household. When Kurusu began to carry her up the stairs, she was immediately perceived as a rival by Miia (who has concluded that the other girls don't rate as competition).