Marvel: My Sign-in System

Leon transmigrated and became a lab rat for Hydra. But he ended up awakening the sign-in system. [Ding, sign-in reward: Glint-Glint Fruit(Pika Pika no Mi).] He starts by destroying the Hydra Base. He accumulated some time and got himself another reward! [Ding! Get the sign-in reward: Sun Breathing Technique.] . . . Posting on SB, Royal Road and ffndotnet as well.