Spending a Month with My Sister

Your lazy sister is spending her money on new things.
Where is she even getting this money from?

Two sisters started living in my house for one simple reason: it was close to their school.
But each of them had their own hidden agenda.

"Big bro, please always keep at least 100 meters between you and Mikaru-nee!"
"Michiru, you’re the one who should stay away from Yuuhi-nii-san!"

Ah… my daily life is already a complete mess.
And just like that, my chaotic, nostalgic, and lively days with them began.

Parents trust the house to a brother and sister while they travel…

The protagonist Christina is a sister who lives in a church with her stepfather, a priest, and her stepsister, Liz. One year after her stepfather went missing, a merchant suddenly showed up and declared, “You must repay 1,000,000G debt in 30 days.” And thus began Christina’s suffering.

One day, the Queen of Succubus suddenly awoke from a long slumber.
Her powerful aura turned the village girls, cats, and monsters into succubi.
“I’ve decided you’ll be my dinner tonight. Follow me to the castle.
On the way, you’ll be tempted by other monsters…but don’t just leave me to die in the wilderness!”
A little swordsman leaves the village alone, chasing the succubus.
Is there a look in his eyes that suggests determination? Or perhaps ecstasy?