A Sister's All You Need. (light novel)
| I actually was asking myself the same question yesterday, but there isn't much to go on from that episode. Could be one of the many D6 systems out there, they seem to be a lot more popular in Japan than D20 games, compared to the west. |
| There's this manga about a TRPG club, Quick Start!!, which features and references a bunch of Japanese TRPG systems. The translator even adds a lot of text explaining rules, settings, and references. You might be able to find something similar in it. |
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