Though Aster was able to sleep while he was in the secret realm, thanks to Rya and Kana accompanying him, just like the girls he felt something was lacking when they weren't sharing his bed with him.
It was a strange sensation of loss, which he hadn't experienced since he was a normal human back at earth, he was pretty much alone and was never able to make proper friends or have a relationship.
Rya was with him, but he was unaware of her existence, he just thought it was a side effect of spending most of his life in an orphanage without being adopted, but even when he was a normal human surrendering wasn't his thing.
He cheered up, appreciated how the sisters that managed the orphanage treating them like family although they weren't related and looked for a job, slowly but surely he started to do something decent with his life, earning his living and supporting his previous home at the orphanage.