Sanae Nagatsuki is a main character in the series Shinryaku! Ika Musume.
Sanae lives in Eiko and Chizuru's neighborhood. She has a pet dog named Alex, which she mainly focused most of her attention to.
- She eventually develops a huge crush on Ika Musume, implying she may be gay.
- She often tends to go to extraordinary measures to have "Ika-chan" but is always rejected and normally is injured by Ika.
- Sanae has an obsessive crush over Ika Musume, much to Ika's dismay. She is constantly taking pictures of Ika, at first in cosplay, then in canon.
- She's always trying to get intimate with Ika. She often calls her "Ika-chan!" (in English sub, it's "Little Ika" and in the English dub she calls Ika "Squiddie") which warns Ika, who usually prevents Sanae from attacking her by injuring Sanae with her tentacles or fins. Sanae's typical response to this is masochistic pleasure.
- After being trapped in suspended animation and sent forward in time to the timeline of the new Squid Girl, Sanae continues to have an obsessive crush on both Squid Girls, trying to force Ika to eat her "Love Nectar", and getting in the way of the heroic future Squid Girl, who dislikes her and constantly tries to protect herself and Ika from her, referring to her as a pervert and a stalker.
- In a rainy day, she fantasizes about embracing Ika under one umbrella.
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