Chrono Trigger OAV Manga

A Chrono Trigger manga centering on the characters featured in the OAV (a Nu and Kilwala) and featuring others was published in V-Jump in the years immediately after Chrono Trigger's release. Bonus pages about Chrono Trigger regularly appeared with them, including one depicting a 3D model of Robo. It was collected as a tankobon here, but is apparently out of print. Here are the first three pages of Chapter Nine:

From: Merchandise

Thanks to RioRock