Hey I'm planning for a solo trip from 1st April 2018 to somewhere around 10th-13th depending on the pricing of AirAsia, Singapore Airlines and JAL.

Here's some question that I have in mind that I need you guys to help me with so please bear with me.
Is it advisable for me to book flight ticket/airbnb as early as now given that the date that I'm planning to go is pretty much "hot" season for tour industry in Japan. (don't really plan to stay in hotel because I'm traveling alone and don't really care about comfort either since I'm just going to sleep there)

Actually I don't have much thing planned for my trip except going here and there around Kanto aimlessly to enjoy cherry blossom and the concrete jungle of Akihabara for the first half of my trip and maybe attend AKB Theater or some of the band concert that I'm interested with if they ever perform in the period of me being over there.

After Kanto I'm planning to go to Kansai region for the second half of the trip maybe enjoy one or two temple visit and rent a car for 2 days just to go and enjoy driving aimlessly and get lost. I will return back to Malaysia from Kansai Airport if I don't have anything new planned for the trip for the time being, like if I'm crazy enough to go to Sapporo after Kansai maybe then something will change.