A full marathon built around breaking four hours, held on a JAAF-certified 10 km loop on the Arakawa riverbank in Itabashi, Tokyo, with start and finish at Toda Bridge Athletics Stadium and only a few meters of elevation difference. The field is limited to 200 runners, first come first served, with 30 places per group, and groups can be changed after entry. The fee is 13,200 yen and the time limit is 4:30. Pacers run front-loaded plans for 3:50 and 3:55, an even-paced plan for 3:58 and a back-loaded plan for 4:00. Each lap has three aid stations, all stocked with Aminovital GOLD drink and Amino Shot Perfect Energy gel. Runners line up five minutes before the 9:30 start and can warm up on the riverbank or at the stadium until then. The race is a designated R.LEAGUE event, with a 10 percent entry discount from a runner's second start, and a partner race of TEAM ONE TOKYO, which offers a chance at Tokyo Marathon entry.
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Event name — (Tokyo Arakawa) THE CHALLENGE RACE SUB4 2: JAAF Certified Race (【東京荒川】THE CHALLENGE RACE SUB4 2｜日本陸連公認レース).
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