Fuck. I knew it. I was having many theory, which was the mc prolly was in a battle of mind with an enemy which lets say a demon king or demon lord, with its special people which was the other girls except Eva, and mc the Hero, prolly that, the Demon King or Lord used its last card which was the Mind Game, where the Hero will be put to sleep, and this girl Eva, was prolly a teammate of the Hero or a close one to the mc the Hero. So Eva was the only one whos able to guide hero by doing some sort of spell, so she can be with the Hero and guide him. About the other girls, is prolly that they are skilled at that sort of spell, so they were able to go with the Demon Lord and Hero, the Demon Lord was the woman who pierced his chest, stating that, that was the activation of the spell, then the other girls was the servant of Demon Lord and were there to keep mc in that world, and about the other Hero's teammates, was prolly only a woman can do that spell, or wasn't skilled in that special type of spell. But she mentioned that he will go to the next world if she just lets go of her. Which states it to be not likely a mind game from enemies, just that the Hero's Party lost to the Demon Lord, and Eva was most likely the close one of the Hero, and Eva thought, the Hero did so much already that she thinks she deserve this kind of death, which was relieving desires and memories, by putting this Mind Spell to the Hero before he dies, as they lost to the Demon Lord. Only the Hero can choose whether to end the Mind Spell, so if he wishes to complete all the "world" he'd finally rest and be put to death bed. I'd say the dev didn't have a time for other worlds, cause im sure the moment Eva started to fade, you should be able to choose whether to "let go" of her or not. The last ending ended as the other, so i think there was more ending we could have had. Also the dev prolly didn't have time for other "world" so the dev ended it right at the end. I was kinda sad and dissatisfied, after checking the Game's Thread and seeing it mark as [Final]. Though im sure if the dev had the time, it would've be much pleasant, as the blowjob was done well but could be putted a lil bit of work more. Though im expecting a sequel to this. Orrr could be that the "world" is an indication that it'll have a sequel which will be an entire game. So I'd say if im somehow right that'd be cool.
Sorry for my terrible english and explanation.