Tsumasaki ni Kourozu

With his professor’s recommendation, Iwai Arata took up a part-time job under Murota, a rather eccentric mycologist. Though cold at first, Murota warmed up to his new co-worker. With him, Iwai discovered a whole new world and gained new outlook on life. Though he enjoyed every day to the fullest, Iwata began to feel ill at ease.
(Source: Echochi Scans.)