Normally, you don't try to save hoes. But she is a [hot] damsel in distress due to no fault of her own.
.....
In RL you would just keep it moving , but in Hentai land (where the reward is [usually] worth the effort) you might be able to save the day without fighting (since the MC clearly can't). Oh well, lets see where it goes.
Some tags make no sense. Per the translation the glasses guy is a student crashing at Shizue's place and he's not in any relationship with her, this story is neither netorare nor it involves cheating.