Training of the Cybernetic Heroine of Justice

Hayato (the protagonist), born in a village on the border of the Kingdom of North Aura, lived a peaceful life with his childhood friend Leia (the heroine).
However, the peaceful life of the village was threatened by an invasion from a neighboring country.
In order to save the village from this crisis, Hayato and Leia decided to join the Royal Knights, but…
Set in the Kingdom of North Aura, with its strict class system, this is a classic childhood friend cuckold RPG in which your beloved girlfriend is taken away by another man!

The young girl Rayne, who became the sacred knight of the kingdom, was entrusted by Jas, the leader of the sacred knights and her lover, to investigate the disturbances occurring in a distant town named "Hakudeti".
 
These disturbances involved a surge in criminals in the previously peaceful town of Hakudeti, an overflow of monsters in the nearby areas, and even the appearance of a mysterious dungeon.

Me and my mother lived in a two-person apartment.
Everything was fine, we weren't rich but it was comfortable.
My father had died when I was young, leaving mom to
raise me. She had her own aspirations, but always put
me first.

Elegant, tender and generous. Very beautiful. I was proud of my mother.
She was mine and mine alone... or so I thought...

Little by little, our happy life began to crumble...

It's all the fault of a classmate I hate... Kazuya Eguchi.

He was shameless, crass, violent...
Everything that was mine, everything I cared about, he destroyed...
That son of a bitch never thought about anyone but himself...
He treated women like disposable sex objects...

The most unforgivable thing is he did it with my mom...

Tonight, I'm gonna get my friend to fuck my girlfriend...
Akitoshi, a cuck at heart, wants to see his straight-laced, art student girlfriend Minatsu get fucked by another man no matter what!!
He can't hold back the desire.

Upon discussing this with his childhood friend, Haruki...
Haruki: “Got it.”
Haruki: “So you want me to fuck Minatsu-chan?”
Akitoshi: “Yeah. I'm begging you.”
Haruki: “For real? Like, are you serious?”
Akitoshi: “I’m always serious.”
Haruki: "You... you're outta your mind..."
And so, after the three of them had dinner, the two idiots tried their best to get her in the mood.

In the town of “New Helio” in a certain fantasy world, a dungeon full of monsters suddenly appeared near a peaceful country one day!
To defeat the terrifying dungeon boss from which monsters keep overflowing, a hero was summoned from another world…!
The hero summoned from another world chose Eleanor, just an ordinary housewife, as his companion, aiming to defeat the dungeon boss!!