Considering her age, personality, and the fact she doesn't know what being in love is she shouldn't be concerned about showing off her underwear. I'd buy this if they were in high school and not middle school barely 13 or 14 years old.
P6, it was that moment Kubo-Onee-San knew she gonna have "fun"
P6, it was that moment Shiraishi-kun knew he's gonna end in a fokt up situation.
P8, it was that moment Kubo-san knew she is in a fokt up situation.
@Lyanhyrt after chapters with porn mags and lot of discussions after that about boobs size - you thinking about age and purity just now, when she is buying sexy underwear? Really? 😁