Dressed as Kirito's Brother and Kidnapped Asuna

He Zhen, a social worker who died suddenly while working overtime, traveled to the world of "Sword Art Online" and became the eldest son of the Kiritani family - Kazuma Kiritani. He was fully expecting to welcome the original protagonist Kirito, but when the girl named Kiritani Kazuna was adopted and walked in, he was completely stunned. The swordsman in black who attracted all the attention turned into a sensitive and introverted girl? With prophecy and obsession, Kazuma silently guards Kazuna, accompanying her to grow up, and accompanying her to enter the death game of SAO. When everyone was struggling for survival, Kazuma unexpectedly discovered that his HP was actually the highest level EX in the game! There are no fancy skills, just a bottomless health bar. This time, he will not be a swordsman or grab the spotlight, but will only be her strongest shield. Kirito and Asuna have a sexual transformation, make up for all the differences, no one is injured, and return home alive!