Growth-Type Superhero is a Manga/Manhwa/Manhua in english language, Academy series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

In an era of upheaval, humanity is forced to respond with weapons known as “Sacred Relics” that embody their very souls to combat monsters emerging from another world. Asahi Hinata, a young man with a promising future as the son of a hero, is about to attend the entrance ceremony at the National Valkyrie Academy. However, the Sacred Relic he receives is a hero suit that looks like it came straight out of a low-budget children’s hero show… Living day by day as an outcast at the academy, Hinata perseveres despite being disregarded by those around him. But one day, Hinata’s courage and resolve awaken a unique power within his hero suit…