Nyarko is usually happy and hyper, but she's caught a cold and is stuck in bed. Nyarko is smitten by Mahiro, who's being a little nicer than usual. It's then that they get a report that an intruder has shown up at the North Pole. They leave Nyarko behind to recover and find that Mi-go was waiting for them...
It's only natural to add in capturable 
characters and plus situations.
El aumento de personajes conquistables y las 
situaciones extras son un desarrollo muy normal.
El aumento de personajes conquistables y las escenas extra son algo de lo más normal.
Nada mais natural que adicionar 
personagens adicionais e situações extras.