Reborn as a Woman

A brilliant science student goes deep into the mountains to teach, fulfilling his girlfriend's dying wish. He is trapped beneath the rubble of a collapsed classroom while saving two students, then is reborn in ancient times as a beautiful woman. After enduring helplessness, panic, and confusion, he eventually accepts everything about the original owner and uses the knowledge from his past life to advance technology, helping the person the original owner loved reclaim everything he once lost, and ultimately rise to the pinnacle of life.