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.
Just a heads up, you might want to prepare to update this soon. It suffers from no-progress bug that is currently under rapid debugging.
Scheduled to be fixed on May 1st at 22:00 JST. 聖騎士リアナ
Hi these link were dead,could you please reupload these? [200918][知恵の実] 後輩日菜の誘惑キャンプ♪ 大自然の中で朝まで汗だくナマエッチ【KU100】【電車の音 川の音 虫の音 超臨場感フォーリー】 [RJ298895]
[201101][知恵の実] 何って?彼氏とエッチする時のイメトレだよ!!-幼馴染の妹が突然やってきては、僕をエッチの練習台にしたがる件-【KU100ハイレゾ】 [RJ304879]