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Now the real monster, the real danger that sneak up on you, the ntr case that has claimed the most victims so far: The case of Nick the nice guy. Heavy spoilers ahead.
Let's meet Nick. Nick is a normal guy. Simple and kind. Won't hurt a fly. Doesn't make much of an impression but pretty likable nonethless. Has friends. So far all is well. The thing is, Nick isn't aware of it, but he has a problem. A big one. He's a minor character in a hentai game, a minor character who has a smoking hot girlfriend ... Yep, you know where this is going. Remember when i mentioned that protag-kun was doing most of the cucking? Guess whose girl he's stealing? Right on the money, it's Nick's. Aaaand it gets real tragic. Like innocent forest critter getting runover by a train kind of tragic. No comfortable feeling here. Poor guy didn't deserve any of what happened to him. He didn't even realise the cuck train was comming towards him at full speed. Absolute annihilation.
Verdict for cuck alert 3: high voltage, empathize too much with Nick and you'll find yourself sharing the cuck chair with him. Unavoidable unless you're ready to skip big parts of the story. Steel yourself or pass.