A girl who's suddenly lost her ability to speak transfers to a new school and uses a sketchbook to communicate. She befriends another girl, who has the ability to read minds when she was being looked over by her classmates.
The manga provides examples of:
- Adults Are Useless: The school staff mainly treats Mashiro like any other student and doesn't provide any special accommodations to her, leading to her being unable to order in the cafeteria without Kokosaki's help. Ms. Sanada, however, realizes that this isn't the best approach after Kokosaki calls her out on it and tries to do better.
- Ambiguously Gay: Kokosaki finds herself being genuinely happy whenever she was with Mashiro and occasionally slips into blushing deeply whenever she thought about her.
- Aw, Look! They Really Do Love Each Other: While she is sometimes shown being annoyed by Mashiro's cluelessness, Kokosaki truly cares for her and is horrified to learn that she had separated from her during the field trip.
- Blessed with Suck: Kokosaki's telepathy can't be turned off, meaning that any large crowd would cause her a Sensory Overload, and she can immediately tell when other people are badmouthing her in their minds; this basically means she has to become a loner, which she does before meeting Mashiro.
- Cute Mute: Two weeks before she transferred to a new school, Mashiro lost her ability to speak.
- Delinquents: Kokosaki fits the mold from the way she dresses to her abrasive nature.
- Exactly What It Says on the Tin: The story is about a mute girl and the girl who befriends her. The only major part of the story the title doesn't convey is the fact that the new friend is a telepath.
- Former Teen Rebel: A flashback shows a teenaged Ms. Sanada smoking a cigarette and arguing with a teacher.
- Hidden Depths: Ms. Sanada was a Former Teen Rebel who wanted to grow up to be a teacher who could understand her students, only to believe that students and teachers couldn't understand each other.
- Jerk with a Heart of Gold: Kokosaki can be abrasive and admits that she started to hang out with Mashiro because her negative thoughts continually threw her off, but overtime, it is made clear that she cherishes her friendship.
- Morality Pet: Mashiro gradually becomes this for Kokosaki. In one instance, Kokosaki nearly panics when she got separated from Mashiro.
- New Transfer Student: Mashiro transfers in at the start of the series. Kokosaki ends up being the only one who bothers to talk to her after the novelty of Mashiro being a transfer student wears off.
- Nice Girl: Mashiro is a pleasant and friendly individual who easily gets along with Kokosaki. She even doesn't blame Sanada for not telling the staff about her aphonia, since she's grateful for Sanada not acting differently around her.
- Only Sane Man: Kokosaki is there to balance out the antics of the other characters.
- Poor Communication Kills: Mashiro's friend Saku incorrectly perceived Kokosaki as being bad news due to her appearance.
- "The Reason You Suck" Speech: Kokosaki gives Sanada a brief one after learning that the cafeteria staff didn't know that Mashiro can't speak.Kokosaki: Since you're our homeroom teacher, the least you could do is let the other staff know about Mashiro's aphonia. You're a terrible teacher.
- Reasonable Authority Figure: Ms. Sanada listens to Kokosaki's criticism of her handling of Mashiro's aphonia without getting angry or defensive, then starts to make more of an effort to reach out to Mashiro.
- Retcon: Mashiro and Kokosaki's homeroom teacher appears to be a man in the first chapter, but is shown as a woman named Sanada in Chapter 9.
- Telepathy: Kokosaki is able to read minds which she often finds cumbersome.
- True Companions: Saku is this for Mashiro best demonstrated when she tried to save Mashiro when she incorrectly assumed that Kokosaki was trying to extort money from her.
- Tsundere: Kokosaki is outwardly harsh, but ends up getting embarrassed when she hears Mashiro's thoughts about how much she likes Kokosaki.
