Aharen-san is Unfathomable [MANGA FANDUB]
Mcshapeshifter for Raidou's Sister
Raidou's younger sister is your typical sister character. She teases him and is weirded out by his antics from time to time, but she does care and worry about him at the end of the day. She seems to be a year or two younger than Raidou.
(Greeting Raidou as he returns home) Welcome back, Onii-chan. Whoa! What are those stuffed toys? If you have too many, give me one!
(Explaining baseball to the reader) The strike zone is approximately the distance from the armpit to the knee. That's basically it.
(Helping Raidou practice lip reading, but using the opportunity to tease him) [Please read the translation after each Japanese phrase in a clarifying tone, as if explaining to the reader] Eh? What a pain! Onii-chan no baka [Onii-chan is dumb]. Ikata-kogeso [Octopus tentacles]. Boku-nenjin [A dull guy].