You might try some free online libraries or novel-sharing platforms, but be cautious as not all of them are legal or reliable.
I think some websites offer free light novel reading, but it can be hard to find ones that have the specific one you want. Sometimes, you could check out forums where readers share links, but again, make sure it's legal.
Honestly, finding a legal and free place to read that specific light novel online can be tricky. Maybe search on less-known book sites, but there's no guarantee you'll find it. It's often better to look for paid but legitimate options to support the authors.