Tensai Ikkyū
Nanana's Buried Treasure - 01 02.04
壱級 天災
Ikkyū Tensai
Age 16
(B. July 26th (Leo)[1])
Gender Female Female
Affiliation The Adventure Club
Status Alive
Light Novel Nanana Volume 1, Tensai Volume 1
Anime Episode 1

Kana Asumi (Japanese)

Tensai Ikkyū (壱級 天災?) is one of the main characters of the series Nanana's Buried Treasure. She is also the lead character of the side story Tensai's Reluctant Deduction.

She is a high-school student who is a self-proclaimed "Master Detective," for obvious reasons that she has very good observation and deduction skills. However, she would also frequently find herself in trouble with the island's police not because she is a repeated young offender, through her habit of intruding in to their investigation whenever a crime happens in the island. She is also a member of the school's "Adventure Club."


Tensai is a short teenage girl with a petite figure who has long blonde hair cut near her chest and has golden red eyes. Jūgo Yama and a few other boys consider her to be very attractive.

She is usually seen in her detective attire or dressed in her school uniform. She once took on a disguise of wearing a black wig with pigtails to fool Jūgo, who was immediately enamored at her look.

Her detective attire consists a white shirt with long sleeve and dark red vest with golden buttons. She also has a dirty white cape about ten centimeters long with dark red lining and dark red small tie, dirty purple-ish blue miniskirt and black thigh-highs, plus brown short boots. She also necessarily wears a dark red hat to better represent her ambition of being a master detective.


Tensai has an intimidating personality, not to mention that she also has a good eye for mysteries. Tensai is very intelligent (as shown in the anime), she is more than capable of analyzing maps, traps, and places in mere minutes, as well as finding the target. She has an inflated view of herself by always calling herself a master detective and sometimes interfering in police matters. Ironically, this reason habit causes her to have a bad rap sheet with the law.

She seems to love to rivaling Jūgo as well, though it seems that this belays some hidden affection towards him.

She has a shy side as well, getting flustered and blushing when Jūgo carried or hugged her.


Jūgo YamaEdit

Tensai found Jūgo to be an interesting person for "accidentally", after witnessing him locate the Shining Lie Detector, and started investigating him. She confronted him at his house, where she equipped a phone hacking application to his cellphone, which allowed her to monitor Jūgo's phone's activities, and discovered he is the heir of the Phantom Thief Gang «Matsuri. This knowledge causes her to consider him as her rival, while he is less than pleased by this, though acknowledges her detective skill and respects her.

While she appears to think lowly of him and is skeptically about him (most likely due to his connections), she confesses to admiring his skill and trusting him in actuality.

Despite insisting that Jūgo is only a rival to her, it is implied on many occasions that she holds some romantic feelings for him. This is best displayed when she blushed heavily when they hugged each other, becoming flustered at him carrying her, and saving him in his fight against Ikusaba. Afterwards, she admitted that she is glad he survived and is flattered by his gratitude of saving him, smiling at him.

D'arc Hoshino Edit

Tensai has an assistant named, D'arc Hoshino /Daruku, in which the two maintain a sort of Sherlock Holmes and John Watson kind of relationship. They are always seen together, with Tensai appearing to care for him and that they are shown to be on good terms. She is either unaware or ignores his obvious attraction to her, perhaps only seeing him as a friend.

Possessed TreasureEdit


Character Art DesignsEdit


Nanae Island Third High School Adventure Club Members
Nanana's Buried Treasure - 01 01.56 Nanana's Buried Treasure - 01 01.58 Nanana's Buried Treasure - 01 01.13 Nanana's Buried Treasure - 01 02.04 Nanana's Buried Treasure - 01 01.25
Isshin Yuiga Yū Ibara Jūgo Yama Tensai Ikkyū Dark Hoshino

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