The Great Villainess: Strategy of Lily

Take the role of an enslaved barbarian that has lost his tribe due to attack by the empire. Purchased by an infamous villainess, a high noble of the empire, you're forced to submit to her due to a magic ring binding you to her.
On an oversea journey, the ship gets attacked and the villainess falls into the ocean. You dive in to save her, and in the process, remove the ring binding you to her. Free from her control, you end up on a desert island together, where the power dynamic is now reversed. She needs you to protect and provide for her, but you haven't forgotten how she's treated you. And her haughty attitude remains. Something that you intend to address.
The game features survival mechanics. Gather resources by mining, foraging, logging, hunting, and fishing. Build and upgrade your base. Craft items and equipment to prepare against the many monsters that threaten your camp. And all the while, don't forget to cook and feed yourself and the villainess. The game features QTE turn-based combat with RPG elements of stat upgrades, as well as a fishing mini game.
The adult content revolves around BDSM relationship you build with the female lead that buds into romance as you live and survive together on the island. The dating sim features feeding and gifting mechanic to progress the relationship. 

The evil organization, the Kargos Group, successfully eliminates the powerful hero squad, the Wide Rangers , using the seductive charms of their female executives.

Pixel Animation × Shooting Action × Dark Fantasy.
The protagonist wakes up in a dungeon and encounters a captive girl.
The two team up, working together to escape from the depths of the dungeon.
Along the way, they meet various heroines and uncover the secrets hidden within the dungeon as the story unfolds.

During a fateful encounter one day, Ritsu meets Lily, a magical being from a far away world, and they strike a deal, one which has the potential to put Ritsu’s life back on track… Or to derail it even further. In exchange for healing her leg injury, which had cost Ritsu her place within the prestigious Furumiya Academy track team, she has agreed to become Lily’s champion and fight evil as a magical girl! Join them as the duo face down evil in the form of mysterious monsters and those who seek to unleash them! 
 
Along the way, they will have to contend with a corrupt Student Council that gleefully uses its power to satisfy their darkest desires, and a shady corporate pharmaceutical empire operating in the shadows that controls both Furumiya Academy and the very town of Shinmachi!

It may have been the curse of the black lilies that bloomed early in the winter--.
It has been 18 years since the new and threatening virus "CLII," which killed more than 50% of minors, was completely contained.
People have completely regained their normal lives, but it has left a huge mark and problem in the society....

A girl who has yet to realize its impact, Sasamori Hana, is a third-year student at Naeshiro High School in Sapporo.
She is a quiet girl, but inside she always feels anxious.
With only a few days left until graduation, Hana finds herself repeating the same day over and over again.

"Ah... that's right. I like Itsuki-chan..."

Hana strongly wishes for the happiness of "Itsuki-chan" who saved her in the past.
She's not even exaggerating it, she would do anything to make it happen.
But she thought the second time, "no, my feelings won't make her happy..."
She thought it was something she shouldn't admit, and it would just ended as "a whim of puberty."
However, that realization led to a deep, deep "curse"....

This is a story of love that weaves between two people in order to persist through such "love" and "curse."