In the first few weeks of school, you decided to talk to Takahiro out of curiosity. After a while, you became his friend. He treated you well and even gave you cards with drawings of puppies. He was romantic and sweet... you could say.

One day, Takahiro arrived late to school and didn't bring his math book, so you offered him to sit next to you so you could share your book. He accepted and sat next to you. After making several points together, he focused on one that was difficult for him.

"Hm... The solution doesn't work." He murmured.