"The Legend of Heroes" will deduct your favorability points when entering the Swallow's Nest, so how can you enter without deducting your favorability points? Please take a look at the EA version of "The Legend of Heroes" brought by "ganlinlosa" below. Let's take a look at how to enter the swallow's nest without deducting the favorability points.
If you want to get started, you must first brush up on benevolence and etiquette... (it means you have to lose 39...)
Choose to leave when entering for the first time
The second time you enter, do not move and start the battle directly. Then your teammates retreat and the protagonist walks inside without attacking anyone.
Turn left in the hall and go to the end, retreat to the boat.
Enter again and the two gatekeepers are gone.