I don't speak English very well. If it's not difficult for someone, a short walkthrough of this game can be.
First, explore the top left room in the mansion. There is only 1 minute each day to find up to three girls, and they are randomly placed in different locations. If you do not find them, you cannot bring them into your party.
Next, explore the fields. You can find it by going to the adventures guild. The fields are filled with enemies, fight them for experience.
If you go to the right, you will travel through a forest, there is a plot event here.
Through the forest is a hill area. Try to find some treasure chests around here (As many as you can), then fight a statue in the bottom right. This statue is very strong, but the items you got from the hill treasure chests hill deal a lot of damage to it. From here you may return to the fields.
If you go down from the fields you will find a bridge with a man. The trick is to keep your party alive for 10 turns, then use steal on the man. If you use explosion the bridge will be broken for many days.
Past the bridge you will find field 2. There is a big enemy in the bottom right of this map, so prepare to fight it. Beating the big enemy, you will unlock a cave area from the adventure guild. I will cover the cave later. After beating the big enemy, you will be asked if you want to return to the mansion. If you want to get more experience in combat, you should stay.
Returning to the mansion, you should go to the bottom left room. You can choose to talk to a girl. If the girls door won't open, you cannot speak to her today. After talking to a girl, you will be sent to the next day. If you do not want to speak to a girl, you can go to the next day by sleeping in your bed. After talking to a girl a few times, you will have an event with her, there are three for you each. There is another guy who has 4 events for each girl, he can randomly get one after he talks to the girls a few times. You CANNOT stop him.
Next day, you will have to repeat the event where you find the girls. This happens every day so prepare to look for them quickly.
At the adventure guild, you can go to the cave if you fought the big enemy. The cave can be confusing as there is a maze with many entrances. Do not go into the maze yet.
Continue through the cave until you reach a bridge. By crossing this bridge, you will be separated from the girls until you return to the mansion. In exchange you will get an axe to break logs.
After you get the axe, you will be forced into the maze. This is a good time to explore it as skeletons will chase you if the blue girl is in your party.
Your goal now is to search for logs in the fields and cave areas. You need a lot of them, as you need around 30 logs to build a bridge. There are 4 bridges, and more then enough logs to build them.
You can fight a big skeleton at the end of the cave, after building some bridges.
There is also a succubus in the cave, but you must find two orbs to find her. The orbs are in the cave but they can be hard to get.