Shin Megami Tensei V: Vengeance has several points in the story where you'll have to make decisions to advance the plot. One of the most important decisions in the game comes after defeating Lahmu and talking to Yuzuru with Ichiro. Here's how to go about it.
These Jacks Are Hee-vil! | Shin Megami Tensei V: Vengeance
Lahmu is a formidable boss at this stage of Shin Megami Tensei V: Vengeance and requires some finesse to defeat. Once you’ve taken this horde, you’ll encounter Yuzuru and Ichiro, who approach you to ask what just happened. This is where you’ll be given two different options to choose from.
If you haven't reached this point in the story yet, beware of the spoilers below.
Essentially, since Lahmu has fully possessed Sahori and split the Nahobino, your character is on the brink of death. Shortly after, Tao is dealt a fatal blow as well. However, Tao's alternate self awakens, temporarily reviving her and restoring the Nahobino to full strength before seemingly dying. This heroic act allows the Nahobino to kill Lahmu and the possessed Sahori as well.