A Ninja and an Assassin Under One Roof episode 6 is set to release on Thursday, May 15, 2025, at 10:30 pm JST, according to the series' official website. It should feature the introduction of another ninja pursuer from Satoko's village, and aside from that, possibly shed some light on Konoha Koga's true identity, which was teased in episode 5.
Although formal leaks for the television anime series of the Spring 2025 season are unlikely, A Ninja and an Assassin Under One Roof episode 6 has officially confirmed release information.
A Ninja and an Assassin Under One Roof episode 6 release date and time

A Ninja and an Assassin Under One Roof episode 6 will air on Japanese television networks at 10:30 pm JST on Thursday, May 15, 2025. Almost every other timezone and region will see this translate to a release sometime on May 15 locally as well. However, some may get to witness the latest episode quite early on the next day. The exact time of release will vary with time zone and region.
A Ninja and an Assassin Under One Roof episode 6 will air in Japan at the following times in the corresponding time zones:
Where to watch A Ninja and an Assassin Under One Roof episode 6

According to the main promotional video release, A Ninja and an Assassin Under One Roof episode 6 will first air on AT-X on May 15, 2025, at 10:30 pm. It will then be available on BS11 about two hours later, on May 16, 2025, at 12:30 am. The episode can also be watched on KTV starting May 16, 2025, at 01:45 am JST. It will also be available on Crunchyroll.
For international viewers, A Ninja and an Assassin Under One Roof episode 6 will be available on platforms such as Hulu, Prime Video, Plex, and many others. However, these platforms will require a subscription.
A Ninja and an Assassin Under One Roof episode 5 brief summary

Titled A Robot and an Assassin Under One Roof, the episode began with a Satoko robot waking up Konoha. For context, the former had been captured by Marin Izutsumi. The blue-haired girl replaced the ninja with her robot, who had learned to become Satoko and was doing the same things she used to. But Konoha was as sharp as ever, noticing her breakfast miso tasted different.
As it stands, Marin was also an assassin like Konoha. But she too faced the issue — leaving behind too much evidence, due to which she was low in the rankings. However, she noticed Konoha shoot up and, upon further digging, found out about Konoha and Satoko. Thus, she decided to kidnap Satoko and use her for the same thing.
Meanwhile, Satoko was counting on Konoha to notice the robot's lack of ninjutsu to turn her targets into leaves. But even that didn't help— Marin and Satoko followed Konoha and Roboko on a mission, only to see the robot incinerate the target's body. She was shocked at Konoha not noticing the difference between her and the robot.

Thus, Konoha took Roboko home and began eating extravagant meals daily. A month passed with Konoha living with Roboko and Satoko with Marin. Moving on, Roboko was also able to detect a ninja pursuer and made short work of her, swiftly but quite brutally. The next day, the pair went to complete a job in the mountains, and Konoha was highly appreciative of Roboko's help.
The two were bonding quite well, with Konoha even sharing her blanket with Roboko when it got too cold. At the other end, Satoko and Marin were going great too. The latter also rose up the rankings thanks to Satoko's ninja technique. However, the purple-haired girl was feeling just one thing— the pain of being unwanted and replaced by Konoha.
As Konoha and Roboko spoke about their present and Konoha's past was teased, Satoko exploded into the cafe they were at. With her came Marin, the pairs facing off against each other. The episode ended with the real Satoko proving herself by turning Roboko into a pile of leaves, as her ninja technique usually did. This ended up leaving Konoha devastated.
What to expect from A Ninja and an Assassin Under One Roof episode 6 (speculative)

A Ninja and an Assassin Under One Roof episode 6 will feature another brief phase in the chaotic lives of Konoha and Satoko. It might glimpse how the former feels now, with Roboko gone.
Although the previous episode was comedic relief, it subtly hinted at the series addressing the feeling of being unwanted. Moreover, it also set the stage for a flashback, most likely Konoha's. A Ninja and an Assassin Under One Roof episode 6 will introduce another ninja pursuer and possibly reveal the truth behind Konoha Koga.
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