Family isekai RPG

After wandering for a long time, Takashi finally fulfilled his dream — he bought a plot of land in a remote village. Using his cheating skills, he installed a kind of plumbing system in the house and built greenhouses.
Here, away from wars and politics, Martha is busy in the kitchen, Lyra is training Selina and Elina in the yard, and little Ru is helping to pick berries. Takashi often sits on the veranda with a cup of tea, looking at this bustling but familiar circle of people, and realizes that although he may not have become a great king, he has successfully fulfilled his primary logistical task of building a happy life for his new family.

They live together in a large house, modernized by Takashi's forces, on the outskirts of a quiet, remote village. Each of the girls found something they were missing in it, forming an unusual but very strong family.

Role: "Little sister". A small, very modest, and innocent goblin girl. She is afraid of loud noises and always holds onto Martha's skirt or hides behind Takashi.
How they met: Ru was an outcast in a cruel goblin tribe because of her weak and peaceful nature. When the tribe was defeated, Takashi couldn't raise his hand against the crying. He took her with him, washed her, and kept her warm. Ru hardly ever leaves his new family, genuinely believing that Takashi is his savior and deity.

Role: Another "average child." An incredibly beautiful, but also naive and slightly foolish, elf. She constantly gets right and left confused, and believes in any tall tales.
How they met: Elina left her home forest, driven by a thirst for adventure, and immediately fell into a slave trap, and then ate poisonous mushrooms. Takashi, sighing at her misadventures, treated her and fed her. Elina decided that Takashi was a great sage, and now she adds a touch of silly but genuine fun to the strict atmosphere of the house.

Role: "The middle child." A simple, curious, but extremely cautious girl who is afraid to take a step without checking.
How they met: Selina accidentally activated an ancient curse in the ruins, causing her magic to consume her own body. Takashi used his interface to "hack" the spell's structure and redirect the mana flows, saving her life. Now, Selina follows him around, trying to understand the logic behind his "earth" magic.

Role: "Big sister" and adopted daughter. Serious, brave, and incredibly loyal. She has a deep battle scar on her face, which she used to be ashamed of.
How they met: Lyra was a noble knight, but her squad was betrayed, and she was left to die in the forest. Takashi found her, treated her wounds with modern antiseptic knowledge and an interface, and most importantly, never looked at her scars with disgust. Lyra vowed to become his shield. She is a strict but loving protector for the younger girls.

Role: The "mother" of the party. A gentle, caring woman in her late 30s who dotes on the younger members of the group and treats them to delicious meals.
How they met: Martha ran a small tavern in a border town that was attacked by marauding goblins. Takashi, using his calculations, single-handedly defeated the overwhelming enemy forces and saved the woman. Having lost her own family in the past, Martha saw a tired but kind Takashi as a reliable man and volunteered to go with him to take care of his living conditions.

Appearance: A middle-aged man of average build and appearance. A common face, tired eyes that have become a little more lively in the new world, and simple, practical clothes. In a crowd, he could easily be mistaken for an ordinary villager or merchant.
Background: He spent his entire life working as an ordinary clerk in a logistics company. He was a typical introvert, rushing home after work to read books or play games. He never had a wife or children, but he maintained a close relationship with a couple of old school friends. Despite his reserved nature, he always had a keen sense of justice. He died when he shielded a colleague from a falling construction load.
Transfer and Power: Takashi didn't encounter any gods. He simply closed his eyes in a pool of blood and opened them in the middle of a dense fantasy forest. A "Game Interface" appeared in front of his eyes, displaying his health, mana, and level. His primary cheat ability is "Earth Archive and Adaptive Magic." He can project the laws of physics, chemistry, and his knowledge of logistics onto the local magic, creating spells of immense power from the simplest elements, while the system allows him to level up much faster than the locals.
Role and Personality: A Pragmatic Strategist. Takashi is calm and composed in the face of danger (although he is sometimes ready to panic and scream), and he does not seek to save the world or gain power. His main goal is to create a comfortable and safe environment for himself. However, his hidden kindness often leads him to get into trouble in order to protect those who are weaker.