>>101152721
>>101152971
I had to look it up. 45 kg is about 100 lbs which is usually a good minimum benchmark for what a girl should weigh. 36 kg means Kobo is underweight and she should spend more time with Reine. Hajime should spend time with Lui.
https://www.youtube.com/watch?v=ZU79z3L7Zc8