My Girlfriend's Mom is Much Finer than Her, So I Can't Hold Back!!

I was walking home as usual at dusk. The sky was dyed red, and crows were cawing in the residential area. The front door of a certain house quietly opened. “I’m a man, so I have to protect,” “I must not lose.” With a single fingertip, she stripped away all of those sense of role. The pain, shame, and even self-denial all transformed into a strangely sweet warmth the moment she witnessed them.

Aoyagi Yoshino wanted to be a pianist when she was young, but she couldn't achieve that dream. Now, she's the president of a company, is married and has a daughter.

Her daughter has talent with the piano too, so Yoshino wants her to become a pianist and achieve the dream that she couldn't. Everything was fine until her daughter got a boyfriend.

Yoshino thinks that having a boyfriend is gonna make her daughter not want to study abroad and her piano dream will fail again. So, Yoshino decides to seduce her daughter's boyfriend in order to make him break up with her.

This is an immersive cohabitation simulation game with Umi, brought to life with full Live2D and full animation.
Raise her affection level through [Conversation], [Touching], and [H-scenes], and enjoy all of Umi's various reactions! Umi's responses will change based on her affection level and daily state. As your intimate relationship progresses, you might even be faced with the "responsibilities of a man"!?

Aoi and Aya were attending the same university and were living together.
Their relationship is going well, and they even start to talk about getting married after graduating from university.
Then one day, the apartment they were living in catches fire.
When they are wondering where to live after the accident, a rescue hand comes from Aoi's father, Kouhei.
He suggests that the two of them live together at his house temporarily.
Aoi was hesitant, as he distrusted his father a little, but eventually accepted the proposal and started living at the home with Aya.
Perhaps because of their matching personalities, Aya and Kouhei become close as if they were a real parent and child, maintaining a suitable distance.
Aoi is relieved by this and lets out a sigh of relief.
But behind him...........

The protagonist Junjiro was pessimistic and unhappy as a child because he was born with a weak body, but gradually regained happiness due to his best friend Yousuke who was always by his side and supporting him.
Shiori, who met them during school was also saved by Yousuke.
The three became good friends, but eventually Junjiro fell in love with Shiori. However Junjiro also noticed that Yousuke had feelings for Shiori too, and unable to control his own feelings, Junjiro told Yousuke how he felt and got him to help confess his love for Shiori and started dating.
As time passed, Junjiro and Shiori married and moved to the city. Junjiro eventually became concerned that he couldn't satisfy Shiori at night due to his physical weakness.
One day, Yousuke came to their city for work, and Junjiro who wanted to pay Yousuke back for his help in the past, forced him to stay with them rather than rent an appartment.
Afterwords, when Junjiro returned home from a business trip, the usually passive Shiori, shown him sexual skills that he had never seen before. Worried about why his wife suddenly changed after being left with their friend, on his next business trip, he set up hidden cameras in the house. However, nothing was shown on them and he became deeply ashamed that he suspected his wife and best friend.
But from there her mood and behavior seemed to change. Is it his imagination, or...