Chapter 145

Box of Happiness (せの) is the one hundred and forty-fifth chapter of Koyoharu Gotōge's Kimetsu no Yaiba.

Summary
The chapter beings with Kokushibo standing over Kaigaku offering him the opportunity to become a demon and become stronger. Kaigaku reflects on his hatred for Zenitsu for his cowardly personality, stating his frustrations at Jigoro for including Zenitsu alongside him as a successor. He then furiously yells that it is only natural for Zenitsu, along with Jigoro to be dead. Kaigaku unleashes his technique; Thunder Breathing, second form: Rice Spirit. Zenitsu angrily asks whether he has lost his sense of right and wrong; Kaigaku unleashes the third form of Thunder Breathing, Thunder Swarm, before answering that he believed that those who understood of his worth were good, and those who deemed him unworthy were the bad. Kaigaku uses the fifth from of Thunder Breathing; Heat Lightning, that burns at Zenitsu's flesh. Zenitsu briefly recalls his training sessions with Kaigaku. Kaigaku pridefully asks about the sharpness of his techniques amplified by his Blood Demon Art, explaining that they would burn and crack the skin and flesh.

Characters in Order of Appearance

 * Kokushibo (flashback)
 * Kaigaku
 * Zenitsu Agatsuma
 * Jigoro Kuwajima (flashback)

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