Ninja Hattori-kun Episode 681

👀 SPOILER-FREE SUMMARY

A classic slice-of-life setup drives this late-series entry as Kenichi finds himself on school cleanup duty with ulterior motives involving Yumeko. The tone is pure Hattori-kun comfort territory — light, fast-paced, and built around escalating comedic situations rather than any heavy stakes. Expect the signature dynamic triangle to be in full effect: Kenichi stumbles through his plans, Hattori deploys ninja ingenuity to help his friend, and Kemumaki schemes to sabotage everything from the shadows. The humor leans on rivalry-driven chaos and slapstick payoffs, with themes of responsibility and teamwork woven into the gags. At episode 681 of 694, the series is deep in its final stretch, and this installment delivers the reliable comedic formula that long-time viewers have come to expect without any signs of slowing down.