Second.. here the MC is left to die by his friend, and finally leaves to know about the world and decides to return.
Title: Arifureta Shokugyou de Sekai Saikyou
And finally, here the MC already knows magic, is very powerful but the one summoned are only three people.. counting him.
He decides to leave his friends and look for a way to return both of them back to their world.
Title: Isekai mahou wa okureteru
From all the three, I find the last one the better. But everyone to their like.
If it's not the thing you are looking for, maybe you can tell me more details.
Buying resources out of their own pockets, spending energy and effort, with almost no return so that everyone can enjoy the cultural and entertainment products of developed countries at almost zero cost walking in the dark to serve the light, they are real heroes