This is a literary work by Natsumaru Abe, published in Shinchosha Bunko, depicting a battle against an unseen enemy. - Title: Invisible Enemy - Author: Natsumaru Abe - Series: Shinchosha Bunko - ISBN: 9784062766960 - Price: 685 yen (excluding tax) It's a story about a boy who lacks self-confidence, and how he finds the meaning of living as himself while interacting with his friends. Thank you for viewing.