If you've already read/seen the original 'Saenai Heroine no Sodatekata', then you'll find yourself re-reading a large chunk of that here. The only chapter that's properly different from the original storyline is Chapter 15, which is the closest it really gets to feeling like an 'Eriri Route'. If you're reading this for a story which is ever so slightly more focused on Eriri and would like to see a few extra scenes of her interacting with Tomoya, then you might enjoy this short read. However, if you're reading in hopes of seeing a fleshed-out alternate route in which the MC ends up with a differentheroine (like 'Saenai Heroine no Sodatekata: Koisuru Metronome', which is a completely new and different Utaha-focused storyline), then this isn't for you.