Tbh the first season has a lot of good episode, i liked it better than the second season (even though the second season was also amazing, especially the Yuri episodes). For me i must say that BFF, Thanks teacher, High-So, the painfull truth and lost and found were the more remarkable for me during the first season, some of them felt really extreme such as High-so, BFF and thanks, teacher but extremely real if i must say.
Always wondered what could have happen if Nanno would have stayed in lost and found, guess we will never know. But i shipped them really hard :c