与四郎くん is a Weiß Schwarz card from ロボティクス・ノーツ RN/W16-044. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
【AUTO】 When this card is place from Hand or Waiting onto Stage, choose 1 of your other 《科学》 Characters, during this turn, it gets +2000 Power.
This card was printed in Japanese only; the English text above is an unofficial community translation.