Sachiko Tanaka

Sachiko Tanaka (田中さち子) is one of the 1st years at Seiran High School. She could be described as following the Chuunibyou trope, believing (or at least pretending) that she can cast spells and make potions, making her one of the more eccentric of the N girls. Her hobby is exploring ruins/abandoned buildings.

Personality
Sachiko's personality is best described as that of a Chuunibyou, someone who believes or pretends that they can cast spells, brew potions, and other magic practices. Because of this, she often wishes to be called "Wizard of the Abyss". Some of her "magical" practices include wrapping up her arm to seal her power, as well as it being mentioned several times that she draws magic circles. She even tried to cast a spell to make the Seiran idols popularity rise, though it didn't seem to work. She also regularly visits a black magic store, and refers to the doorway as "the gate of truth".

Despite this, she has been shown to care deeply for her friends, going out of her way to help them even when it tarnishes the dark and mysterious persona she tries to put on- the best example of this being when she helped Aya out at the maid café, though she also tried to help Marika out with learning black magic.

Home Screen

 * "Daybreak... It's a bit rough for people like me who like the dark." (#21)
 * "Talking to me... You won't regret it." (#21)
 * "This seal on my right arm... Absolutely cannot be removed." (#21)
 * "Muahaha. You tremble before my power?" (#398)
 * "Oh, how my right arm aches. I am a fallen angel who has lost a wing." (#398)
 * "Prepare thyself. I will show thee the path to School Idol performance." (#398)
 * "I have no choice... I'll have to ask Aya for help." (#568)
 * "You want to go look at some abandoned buildings. Hehehe... What a good idea!" (#568)
 * "I thought I told you. I'm not Sachiko. Here, look! Even my nametag says I'm the Wizard of the Abyss." (#568)
 * "I wish to use secret arts research club budget to purchase a large pot... Can I?" (#893)
 * "You saw me in a maid outfit? Hehe... That was an afterimage." (#893)
 * "Marika gets bored of things too easily. The path of black magic is not something to be taken lightly" (#893)
 * "I'll curse you if you don't cheer for me." (#1173)
 * "Maid cafe? Hehe... I don't know anything about that." (#1173)
 * "Ahh, if only my barrier could fend off pollen as well." (#1173)

Tapping the Character

 * "Touching me... There are consequences."
 * "Kyaa!? ...Ahem, I mean, did something happen?"

Event-Triggered

 * "Let us weave history together." (Unread stories)
 * "Now, let the feast begin!" (New live stages)

Minami Nagayama
Minami and Sachiko are good friends. Minami cares for Sachiko, much like she does with the rest of her friends, and even played along with her when Sachiko claimed she couldn't eat dinner with them due to being trapped inside a magic circle, Minami deciding to bring the dinner and the rest of the girls to Sachiko's house so she wouldn't be left out. Minami also refers to her by the nickname "Sacchan".

Aya Sugisaki
Aya and Sachiko are both in the same grade at school, and they appear to be close friends. Sachiko goes out of her way to help Aya at the maid cafe, despite finding the whole ordeal embarrassing, as she brings up multiple times in her quotes. Aya insists that despite Sachiko's strange behavior, she's a "really a nice girl".

Marika Ichinose
Marika gets along with Sachiko, and even tried to learn black magic herself with her help before she got bored of it. She often points out the strange things that Sachiko does, such as when her proposal for their idol costumes was "just a piece of black cloth". She also notices that Sachiko carries around a roll of cloth for rituals, and wonders if she gets cold like that.