Not really? That umbrella thing is just something that he would do, he feels nothing romantically for Mahiru at the start of the story. He thinks she's beautiful, sure, but he thinks of romance as not being worth his time. For a good portion of the start, both of the leads are in mutual...
The thing is, If we go by D&D rules, the MC is a wizard with -3 in con. That should put him at 3HP at level 1 in D&D 5e, which is what the character sheets are from. If we had a wizard from earlier editions, he would have 1 HP at level one, and have a 25% chance to gain 1 HP on leveling up.
Hey, piano player here! She actually plays a B diminished triad at the end there, diminished being the most unhappy triad that you can play in a major (happy) scale without changing the pitch of some note. Pianos are never drawn correctly...