Challengers 4 features story and art by Hinako Takanaga.

Tomoe Tatsumi is leaving Mitsugu Kurokawa for NASA? Tomoe has a once-in-a-lifetime chance to study in America, but what of his once-in-a-lifetime love for Kurokawa? It may be a moot point if that cute female co-worker successfully steals Kurokawa away. Having reached a fork in the road, will they take it? Or will Tomoe's dream turn out to be a nightmare?