One → Shota ← One

"Hello Boku-chan, can you please teach us about this world?"
Two adventurers that said they were from a different world came to my rescue when I was being attacked by monsters in the mountain.
Arin, a cheerful elf that can easily become friends with anyone, and Lulu, a slightly shy but still very gentle beastfolk.
The two of them were troubled, with no way to return home or a place to stay.
"If you don't have anywhere to go to, come to my house!"
I asked my mom so we could help my saviors and lent them an old house that wasn't in use.
Everyday I spend looking after the two of them is very enjoyable and exciting (though there were also some very embarrassing days...)
One day, I heard that they came to me looking for a husband, and I started feeling a different kind of excitement...
What is this feeling...
Can these two Onee-chan teach me?

[Translated from the official site]